User:RazrRekr201/Table of constants

Table of constants and other irrational or transcendental numbers[edit]

Value	Name	Graphics	Symbol	LaTeX	Formula	Nº	OEIS	Continued fraction	Year	Web format
0,70444 22009 99165 59273	Carefree constant ₂ ^[1]		${\mathcal {C}}_{2}$	${\underset {p_{n}:\,{prime}}{\prod _{n=1}^{\infty }\left(1-{\frac {1}{p_{n}(p_{n}+1)}}\right)}}$	N[prod[n=1 to ∞] {1 - 1/(prime(n)* (prime(n)+1))}]		OEIS: A065463	[0;1,2,2,1,1,1,1,4,2,1,1,3,703,2,1,1,1,3,5,1,...]		0.70444220099916559273660335032663721
1.84775 90650 22573 51225 ^{[Mw 1]}	Connective constant ^[2]^[3]		${\mu }$	${\sqrt {2+{\sqrt {2}}}}\;=\lim _{n\rightarrow \infty }c_{n}^{1/n}$ as a root of the polynomial $:\;x^{4}-4x^{2}+2=0$	sqrt(2+sqrt(2))	A	OEIS: A179260	[1;1,5,1,1,3,6,1,3,3,10,10,1,1,1,5,2,3,1,1,3,...]		1.84775906502257351225636637879357657
0.30366 30028 98732 65859 ^{[Mw 2]}	Gauss-Kuzmin-Wirsing constant ^[4]		${\lambda }_{2}$	$\lim _{n\to \infty }{\frac {F_{n}(x)-\ln(1-x)}{(-\lambda )^{n}}}=\Psi (x),$ where $\Psi (x)$ is an analytic function with $\Psi (0)\!=\!\Psi (1)\!=\!0$ .			OEIS: A038517	[0;3,3,2,2,3,13,1,174,1,1,1,2,2,2,1,1,1,2,2,1,...]	1973	0.30366300289873265859744812190155623
1,57079 63267 94896 61923 ^{[Mw 3]}	Favard constant K1 Wallis product ^[5]		${\frac {\pi }{2}}$	$\prod _{n=1}^{\infty }\left({\frac {4n^{2}}{4n^{2}-1}}\right)={\frac {2}{1}}\cdot {\frac {2}{3}}\cdot {\frac {4}{3}}\cdot {\frac {4}{5}}\cdot {\frac {6}{5}}\cdot {\frac {6}{7}}\cdot {\frac {8}{7}}\cdot {\frac {8}{9}}\cdots$	Prod[n=1 to ∞] {(4n^2)/(4n^2-1)}	T	OEIS: A069196	[1;1,1,3,31,1,145,1,4,2,8,1,6,1,2,3,1,4,1,5,1...]	1655	1.57079632679489661923132169163975144
1,60669 51524 15291 76378 ^{[Mw 4]}	Erdős–Borwein constant^[6]^[7]		${E}_{\,B}$	$\sum _{m=1}^{\infty }\sum _{n=1}^{\infty }{\frac {1}{2^{mn}}}=\sum _{n=1}^{\infty }{\frac {1}{2^{n}-1}}={\frac {1}{1}}\!+\!{\frac {1}{3}}\!+\!{\frac {1}{7}}\!+\!{\frac {1}{15}}\!+\!...$	sum[n=1 to ∞] {1/(2^n-1)}	I	OEIS: A065442	[1;1,1,1,1,5,2,1,2,29,4,1,2,2,2,2,6,1,7,1,...]	1949	1.60669515241529176378330152319092458
1.61803 39887 49894 84820 ^{[Mw 5]}	Phi, Golden ratio ^[8]		${\varphi }$	${\frac {1+{\sqrt {5}}}{2}}={\sqrt {1+{\sqrt {1+{\sqrt {1+{\sqrt {1+\cdots }}}}}}}}$	(1+5^(1/2))/2	A	OEIS: A001622	[0;1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,...] = [0;1,...]	-300 ~	1.61803398874989484820458633436563812
1.64493 40668 48226 43647 ^{[Mw 6]}	Riemann Function Zeta(2)		${\zeta }(\,2)$	${\frac {\pi ^{2}}{6}}=\sum _{n=1}^{\infty }{\frac {1}{n^{2}}}={\frac {1}{1^{2}}}+{\frac {1}{2^{2}}}+{\frac {1}{3^{2}}}+{\frac {1}{4^{2}}}+\cdots$	Sum[n=1 to ∞] {1/n^2}	T	OEIS: A013661	[1;1,1,1,4,2,4,7,1,4,2,3,4,10 1,2,1,1,1,15,...]	1826 to 1866	1.64493406684822643647241516664602519
1.73205 08075 68877 29352 ^{[Mw 7]}	Theodorus constant^[9]		${\sqrt {3}}$	${\sqrt[{3}]{3\,{\sqrt[{3}]{3\,{\sqrt[{3}]{3\,{\sqrt[{3}]{3\,{\sqrt[{3}]{3\,\cdots }}}}}}}}}}$	(3(3(3(3(3(3(3) ^1/3)^1/3)^1/3) ^1/3)^1/3)^1/3) ^1/3 ...	A	OEIS: A002194	[1;1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,...] = [1;1,2,...]	-465 to -398	1.73205080756887729352744634150587237
1.75793 27566 18004 53270 ^{[Mw 8]}	Kasner number		${R}$	${\sqrt {1+{\sqrt {2+{\sqrt {3+{\sqrt {4+\cdots }}}}}}}}$	Fold[Sqrt[#1+#2] &,0,Reverse [Range[20]]]		OEIS: A072449	[1;1,3,7,1,1,1,2,3,1,4,1,1,2,1,2,20,1,2,2,...]	1878 a 1955	1.75793275661800453270881963821813852
2.29558 71493 92638 07403 ^{[Mw 9]}	Universal parabolic constant ^[10]		${P}_{\,2}$	$\ln(1+{\sqrt {2}})+{\sqrt {2}}\;=\;\operatorname {arcsinh} (1)+{\sqrt {2}}$	ln(1+sqrt 2)+sqrt 2	T	OEIS: A103710	[2;3,2,1,1,1,1,3,3,1,1,4,2,3,2,7,1,6,1,8,7,2,1,...]		2.29558714939263807403429804918949038
1.78657 64593 65922 46345 ^{[Mw 10]}	Silverman constant^[11]		${{\mathcal {S}}_{_{m}}}$	$\sum _{n=1}^{\infty }{\frac {1}{\phi (n)\sigma _{1}(n)}}={\underset {p_{n}:\,{prime}}{\prod _{n=1}^{\infty }\left(1+\sum _{k=1}^{\infty }{\frac {1}{p_{n}^{2k}-p_{n}^{k-1}}}\right)}}$ ø() = Euler's totient function, σ₁() = Divisor function.	Sum[n=1 to ∞] {1/[EulerPhi(n) DivisorSigma(1,n)]}		OEIS: A093827	[1;1,3,1,2,5,1,65,11,2,1,2,13,1,4,1,1,1,2,5,4,...]		1.78657645936592246345859047554131575
2.59807 62113 53315 94029 ^{[Mw 11]}	Area of the regular hexagon with side equal to 1 ^[12]		${\mathcal {A}}_{6}$	${\frac {3{\sqrt {3}}}{2}}\,l^{2}$	3 sqrt(3)/2	A	OEIS: A104956	[2;1,1,2,20,2,1,1,4,1,1,2,20,2,1,1,4,1,1,2,20,...] [2;1,1,2,20,2,1,1,4]		2.59807621135331594029116951225880855
0.66131 70494 69622 33528 ^{[Mw 12]}	Feller-Tornier constant ^[13]		${{\mathcal {C}}_{_{FT}}}$	${\underset {p_{n}:\,{prime}}{{\frac {1}{2}}\prod _{n=1}^{\infty }\left(1-{\frac {2}{p_{n}^{2}}}\right){+}{\frac {1}{2}}}}={\frac {3}{\pi ^{2}}}\prod _{n=1}^{\infty }\left(1-{\frac {1}{p_{n}^{2}-1}}\right){+}{\frac {1}{2}}$	[prod[n=1 to ∞] {1-2/prime(n)^2}] /2 + 1/2	T ?	OEIS: A065493	[0;1,1,1,20,9,1,2,5,1,2,3,2,3,38,8,1,16,2,2,...]	1932	0.66131704946962233528976584627411853
1.46099 84862 06318 35815 ^{[Mw 13]}	Baxter's Four-coloring constant ^[14]	Mapamundi Four-Coloring	${\mathcal {C}}^{2}$	$\prod _{n=1}^{\infty }{\frac {(3n-1)^{2}}{(3n-2)(3n)}}={\frac {3}{4\pi ^{2}}}\,\Gamma \left({\frac {1}{3}}\right)^{3}$ Γ() = Gamma function	3×Gamma(1/3) ^3/(4 pi^2)		OEIS: A224273	[1;2,5,1,10,8,1,12,3,1,5,3,5,8,2,1,23,1,2,161,...]	1970	1.46099848620631835815887311784605969
1.92756 19754 82925 30426 ^{[Mw 14]}	Tetranacci constant		${\mathcal {T}}$	Positive root of $:\;\;x^{4}-x^{3}-x^{2}-x-1=0$	Root[x+x^-4-2=0]		OEIS: A086088	[1;1,12,1,4,7,1,21,1,2,1,4,6,1,10,1,2,2,1,7,1,...]		1.92756197548292530426190586173662216
1.00743 47568 84279 37609 ^{[Mw 15]}	DeVicci's tesseract constant		${f_{(3,4)}}$	The largest cube that can pass through in an 4D hypercube. Positive root of $:\;\;4x^{4}{-}28x^{3}{-}7x^{2}{+}16x{+}16=0$	Root[4x^8-28x^6 -7x^4+16x^2+16 =0]	A	OEIS: A243309	[1;134,1,1,73,3,1,5,2,1,6,3,11,4,1,5,5,1,1,48,...]		1.00743475688427937609825359523109914
1.70521 11401 05367 76428 ^{[Mw 16]}	Niven's constant ^[15]		${C}$	$1+\sum _{n=2}^{\infty }\left(1-{\frac {1}{\zeta (n)}}\right)$	1+ Sum[n=2 to ∞] {1-(1/Zeta(n))}		OEIS: A033150	[1;1,2,2,1,1,4,1,1,3,4,4,8,4,1,1,2,1,1,11,1,...]	1969	1.70521114010536776428855145343450816
0.60459 97880 78072 61686 ^{[Mw 17]}	Relationship among the area of an equilateral triangle and the inscribed circle.		${\frac {\pi }{3{\sqrt {3}}}}$	$\sum _{n=1}^{\infty }{\frac {1}{n{2n \choose n}}}=1-{\frac {1}{2}}+{\frac {1}{4}}-{\frac {1}{5}}+{\frac {1}{7}}-{\frac {1}{8}}+\cdots$ Dirichlet series	Sum[1/(n Binomial[2 n, n]) , {n, 1, ∞}]	T	OEIS: A073010	[0;1,1,1,1,8,10,2,2,3,3,1,9,2,5,4,1,27,27,6,6,...]		0.60459978807807261686469275254738524
1.15470 05383 79251 52901 ^{[Mw 18]}	Hermite Constant ^[16]		$\gamma _{_{2}}$	${\frac {2}{\sqrt {3}}}={\frac {1}{\cos \,({\frac {\pi }{6}})}}$	2/sqrt(3)	A	1+ OEIS: A246724	[1;6,2,6,2,6,2,6,2,6,2,6,2,6,2,6,2,6,2,6,2,6,2,...] [1;6,2]		1.15470053837925152901829756100391491
0.41245 40336 40107 59778 ^{[Mw 19]}	Prouhet–Thue–Morse constant ^[17]		$\tau$	$\sum _{n=0}^{\infty }{\frac {t_{n}}{2^{n+1}}}$ where ${t_{n}}$ is the Thue–Morse sequence and Where $\tau (x)=\sum _{n=0}^{\infty }(-1)^{t_{n}}\,x^{n}=\prod _{n=0}^{\infty }(1-x^{2^{n}})$		T	OEIS: A014571	[0;2,2,2,1,4,3,5,2,1,4,2,1,5,44,1,4,1,2,4,1,1,...]		0.41245403364010759778336136825845528
0.58057 75582 04892 40229 ^{[Mw 20]}	Pell Constant ^[18]		${{\mathcal {P}}_{_{Pell}}}$	$1-\prod _{n=0}^{\infty }\left(1-{\frac {1}{2^{2n+1}}}\right)$	N[1-prod[n=0 to ∞] {1-1/(2^(2n+1)}]	T ?	OEIS: A141848	[0;1,1,2,1,1,1,1,14,1,3,1,1,6,9,18,7,1,27,1,1,...]		0.58057755820489240229004389229702574
0.66274 34193 49181 58097 ^{[Mw 21]}	Laplace limit ^[19]		${\lambda }$	${\frac {x\;e^{\sqrt {x^{2}+1}}}{{\sqrt {x^{2}+1}}+1}}=1$	(x e^sqrt(x^2+1)) /(sqrt(x^2+1)+1) = 1		OEIS: A033259	[0;1,1,1,27,1,1,1,8,2,154,2,4,1,5,1,1,2,1601,...]	1782 ~	0.66274341934918158097474209710925290
0.17150 04931 41536 06586 ^{[Mw 22]}	Hall-Montgomery Constant ^[20]		${{\delta }_{_{0}}}$	$1+{\frac {\pi ^{2}}{6}}+2\;\mathrm {Li} _{2}\left(-{\sqrt {e}}\;\right)\quad \mathrm {Li} _{2}\,\scriptstyle {\text{= Dilogarithm integral}}$	1 + Pi^2/6 + 2*PolyLog[2, -Sqrt[E]]		OEIS: A143301	[0;5,1,4,1,10,1,1,11,18,1,2,19,14,1,51,1,2,1,...]		0.17150049314153606586043997155521210
1.55138 75245 48320 39226 ^{[Mw 23]}	Calabi triangle constant ^[21]		${C_{_{CR}}}$	${1 \over 3}+{(-23+3i{\sqrt {237}})^{\tfrac {1}{3}} \over 3\cdot 2^{\tfrac {2}{3}}}+{11 \over 3(2(-23+3i{\sqrt {237}}))^{\tfrac {1}{3}}}$	FindRoot[ 2x^3-2x^2-3x+2 ==0, {x, 1.5}, WorkingPrecision->40]	A	OEIS: A046095	[1;1,1,4,2,1,2,1,5,2,1,3,1,1,390,1,1,2,11,6,2,...]	1946 ~	1.55138752454832039226195251026462381
1.22541 67024 65177 64512 ^{[Mw 24]}	Gamma(3/4) ^[22]		$\Gamma ({\tfrac {3}{4}})$	$\left(-1+{\frac {3}{4}}\right)!=\left(-{\frac {1}{4}}\right)!$	(-1+3/4)!		OEIS: A068465	[1;4,2,3,2,2,1,1,1,2,1,4,7,1,171,3,2,3,1,1,8,3,...]		1.22541670246517764512909830336289053
1.20205 69031 59594 28539 ^{[Mw 25]}	Apéry's constant ^[23]		$\zeta (3)$	$\sum _{n=1}^{\infty }{\frac {1}{n^{3}}}={\frac {1}{1^{3}}}+{\frac {1}{2^{3}}}+{\frac {1}{3^{3}}}+{\frac {1}{4^{3}}}+{\frac {1}{5^{3}}}+\cdots =$ ${\frac {1}{2}}\sum _{n=1}^{\infty }{\frac {H_{n}}{n^{2}}}={\frac {1}{2}}\sum _{i=1}^{\infty }\sum _{j=1}^{\infty }{\frac {1}{ij(i{+}j)}}=\!\!\int \limits _{0}^{1}\!\!\int \limits _{0}^{1}\!\!\int \limits _{0}^{1}{\frac {\mathrm {d} x\mathrm {d} y\mathrm {d} z}{1-xyz}}$	Sum[n=1 to ∞] {1/n^3}	I	OEIS: A010774	[1;4,1,18,1,1,1,4,1,9,9,2,1,1,1,2,7,1,1,7,11,...]	1979	1.20205690315959428539973816151144999
0.91596 55941 77219 01505 ^{[Mw 26]}	Catalan's constant^[24]^[25]^[26]		${C}$	$\int _{0}^{1}\!\!\int _{0}^{1}\!\!{\frac {1}{1{+}x^{2}y^{2}}}\,dx\,dy=\!\sum _{n=0}^{\infty }\!{\frac {(-1)^{n}}{(2n{+}1)^{2}}}\!=\!{\frac {1}{1^{2}}}{-}{\frac {1}{3^{2}}}{+}{\cdots }$	Sum[n=0 to ∞] {(-1)^n/(2n+1)^2}	T	OEIS: A006752	[0;1,10,1,8,1,88,4,1,1,7,22,1,2,3,26,1,11,...]	1864	0.91596559417721901505460351493238411
0.78539 81633 97448 30961 ^{[Mw 27]}	Beta(1) ^[27]		${\beta }(1)$	${\frac {\pi }{4}}=\sum _{n=0}^{\infty }{\frac {(-1)^{n}}{2n+1}}={\frac {1}{1}}-{\frac {1}{3}}+{\frac {1}{5}}-{\frac {1}{7}}+{\frac {1}{9}}-\cdots$	Sum[n=0 to ∞] {(-1)^n/(2n+1)}	T	OEIS: A003881	[0; 1,3,1,1,1,15,2,72,1,9,1,17,1,2,1,5,1,1,10,...]	1805 to 1859	0.78539816339744830961566084581987572
0.00131 76411 54853 17810 ^{[Mw 28]}	Heath-Brown–Moroz constant^[28]		${C_{_{HBM}}}$	${\underset {p_{n}:\,{prime}}{\prod _{n=1}^{\infty }\left(1-{\frac {1}{p_{n}}}\right)^{7}\left(1+{\frac {7p_{n}+1}{p_{n}^{2}}}\right)}}$	N[prod[n=1 to ∞] {((1-1/prime(n))^7) (1+(7prime(n)+1) /(prime(n)^2))}]	T ?	OEIS: A118228	[0,0,1,3,1,7,6,4,1,1,5,4,8,5,3,1,7,8,1,0,9,8,1,...]		0.00131764115485317810981735232251358
0.56755 51633 06957 82538	Module of Infinite Tetration of i		$\|{}^{\infty }{i}\|$	$\lim _{n\to \infty }\left\|{}^{n}i\right\|=\left\|\lim _{n\to \infty }\underbrace {i^{i^{\cdot ^{\cdot ^{i}}}}} _{n}\right\|$	Mod(i^i^i^...)		OEIS: A212479	[0;1,1,3,4,1,58,12,1,51,1,4,12,1,1,2,2,3,...]		0.56755516330695782538461314419245334
0.78343 05107 12134 40705 ^{[Mw 29]}	Sophomore's dream ₁ J.Bernoulli ^[29]		${I}_{1}$	$\int _{0}^{1}\!x^{x}\,dx=\sum _{n=1}^{\infty }{\frac {(-1)^{n+1}}{n^{n}}}={\frac {1}{1^{1}}}-{\frac {1}{2^{2}}}+{\frac {1}{3^{3}}}-{\cdots }$	Sum[n=1 to ∞] {-(-1)^n /n^n}		OEIS: A083648	[0;1,3,1,1,1,1,1,1,2,4,7,2,1,2,1,1,1,2,1,14,...]	1697	0.78343051071213440705926438652697546
1.29128 59970 62663 54040 ^{[Mw 30]}	Sophomore's dream ₂ J.Bernoulli ^[30]		${I}_{2}$	$\int _{0}^{1}\!{\frac {1}{x^{x}}}\,dx=\sum _{n=1}^{\infty }{\frac {1}{n^{n}}}={\frac {1}{1^{1}}}+{\frac {1}{2^{2}}}+{\frac {1}{3^{3}}}+{\frac {1}{4^{4}}}+\cdots$	Sum[n=1 to ∞] {1/(n^n)}		OEIS: A073009	[1;3,2,3,4,3,1,2,1,1,6,7,2,5,3,1,2,1,8,1,2,4,...]	1697	1.29128599706266354040728259059560054
0.70523 01717 91800 96514 ^{[Mw 31]}	Primorial constant Sum of the product of inverse of primes ^[31]		${P_{\#}}$	${\underset {p_{n}:\,{prime}}{\sum _{n=1}^{\infty }{\frac {1}{p_{n}\#}}={\frac {1}{2}}+{\frac {1}{6}}+{\frac {1}{30}}+{\frac {1}{210}}+...=\sum _{k=1}^{\infty }\prod _{n=1}^{k}{\frac {1}{p_{n}}}}}$	Sum[k=1 to ∞] (prod[n=1 to k] {1/prime(n)})		OEIS: A064648	[0;1,2,2,1,1,4,1,2,1,1,6,13,1,4,1,16,6,1,1,4,...]		0.70523017179180096514743168288824851
0.14758 36176 50433 27417 ^{[Mw 32]}	Plouffe's gamma constant ^[32]		${C}$	${\frac {1}{\pi }}\arctan {\frac {1}{2}}={\frac {1}{\pi }}\sum _{n=0}^{\infty }{\frac {(-1)^{n}}{(2^{2n+1})(2n+1)}}$ $={\frac {1}{\pi }}\left({\frac {1}{2}}-{\frac {1}{3\cdot 2^{3}}}+{\frac {1}{5\cdot 2^{5}}}-{\frac {1}{7\cdot 2^{7}}}+\cdots \right)$	Arctan(1/2)/pi	T	OEIS: A086203	[0;6,1,3,2,5,1,6,5,3,1,1,2,1,1,2,3,1,2,3,2,2,...]		0.14758361765043327417540107622474052
0.15915 49430 91895 33576 ^{[Mw 33]}	Plouffe's A constant ^[33]		${A}$	${\frac {1}{2\pi }}$	1/(2 pi)	T	OEIS: A086201	[0;6,3,1,1,7,2,146,3,6,1,1,2,7,5,5,1,4,1,2,42,...]		0.15915494309189533576888376337251436
0.29156 09040 30818 78013 ^{[Mw 34]}	Dimer constant 2D, Domino tiling^[34]^[35]		${\frac {C}{\pi }}$ C=Catalan	$\int \limits _{-\pi }^{\pi }{\frac {\cosh ^{-1}\left({\frac {\sqrt {\cos(t)+3}}{\sqrt {2}}}\right)}{4\pi }}\,dt$	N[int[-pi to pi] {arccosh(sqrt( cos(t)+3)/sqrt(2)) /(4*Pi)dt}]		OEIS: A143233	[0;3,2,3,16,8,10,3,1,1,2,1,3,1,2,13,1,1,4,1,5,...]		0.29156090403081878013838445646839491
0.49801 56681 18356 04271 0.15494 98283 01810 68512 i	Factorial(i)^[36]		${i}\,!$	$\Gamma (1+i)=i\,\Gamma (i)=\int \limits _{0}^{\infty }{\frac {t^{i}}{e^{t}}}\mathrm {d} t$	Integral_0^∞ t^i/e^t dt	C	OEIS: A212877 OEIS: A212878	[0;6,2,4,1,8,1,46,2,2,3,5,1,10,7,5,1,7,2,...] - [0;2,125,2,18,1,2,1,1,19,1,1,1,2,3,34,...] i		0.49801566811835604271369111746219809 - 0.15494982830181068512495513048388 i
2.09455 14815 42326 59148 ^{[Mw 35]}	Wallis Constant		$W$	${\sqrt[{3}]{\frac {45-{\sqrt {1929}}}{18}}}+{\sqrt[{3}]{\frac {45+{\sqrt {1929}}}{18}}}$	(((45-sqrt(1929)) /18))^(1/3)+ (((45+sqrt(1929)) /18))^(1/3)	T	OEIS: A007493	[2;10,1,1,2,1,3,1,1,12,3,5,1,1,2,1,6,1,11,4,...]	1616 to 1703	2.09455148154232659148238654057930296
0.72364 84022 98200 00940 ^{[Mw 36]}	Sarnak constant		${C_{sa}}$	$\prod _{p>2}{\Big (}1-{\frac {p+2}{p^{3}}}{\Big )}$	N[prod[k=2 to ∞] {1-(prime(k)+2) /(prime(k)^3)}]	T ?	OEIS: A065476	[0;1,2,1,1,1,1,1,1,1,4,4,1,1,1,1,1,1,1,8,2,1,1,...]		0.72364840229820000940884914980912759
0.63212 05588 28557 67840 ^{[Mw 37]}	Time constant ^[37]		${\tau }$	$\lim _{n\to \infty }1-{\frac {!n}{n!}}=\lim _{n\to \infty }P(n)=\int _{0}^{1}e^{-x}dx=1{-}{\frac {1}{e}}=$ $\sum \limits _{n=1}^{\infty }{\frac {(-1)^{n+1}}{n!}}={\frac {1}{1!}}{-}{\frac {1}{2!}}{+}{\frac {1}{3!}}{-}{\frac {1}{4!}}{+}{\frac {1}{5!}}{-}{\frac {1}{6!}}{+}\cdots$	lim_(n->∞) (1- !n/n!) !n=subfactorial	T	OEIS: A068996	[0;1,1,1,2,1,1,4,1,1,6,1,1,8,1,1,10,1,1,12,1,...] = [0;1,1,1,2n], n∈ℕ		0.63212055882855767840447622983853913
1.04633 50667 70503 18098	Minkowski-Siegel mass constant ^[38]		$F_{1}$	$\prod _{n=1}^{\infty }{\frac {n!}{{\sqrt {2\pi n}}\left({\frac {n}{e}}\right)^{n}{\sqrt[{12}]{1+{\tfrac {1}{n}}}}}}$	N[prod[n=1 to ∞] n! /(sqrt(2Pin) (n/e)^n (1+1/n) ^(1/12))]		OEIS: A213080	[1;21,1,1,2,1,1,4,2,1,5,7,2,1,20,1,1,1134,3,..]	1867 1885 1935	1.04633506677050318098095065697776037
5.24411 51085 84239 62092 ^{[Mw 38]}	Lemniscate Constant ^[39]		$2\varpi$	${\frac {[\Gamma ({\tfrac {1}{4}})]^{2}}{\sqrt {2\pi }}}=4\int _{0}^{1}{\frac {dx}{\sqrt {(1-x^{2})(2-x^{2})}}}$	Gamma[ 1/4 ]^2 /Sqrt[ 2 Pi ]		OEIS: A064853	[5;4,10,2,1,2,3,29,4,1,2,1,2,1,2,1,4,9,1,4,1,2,...]	1718	5.24411510858423962092967917978223883
0.66170 71822 67176 23515 ^{[Mw 39]}	Robbins constant ^[40]		$\Delta (3)$	${\frac {4\!+\!17{\sqrt {2}}\!-6{\sqrt {3}}\!-7\pi }{105}}\!+\!{\frac {\ln(1\!+\!{\sqrt {2}})}{5}}\!+\!{\frac {2\ln(2\!+\!{\sqrt {3}})}{5}}$	(4+172^(1/2)-6 3^(1/2)+21ln(1+ 2^(1/2))+42ln(2+ 3^(1/2))-7*Pi)/105		OEIS: A073012	[0;1,1,1,21,1,2,1,4,10,1,2,2,1,3,11,1,331,1,4,...]	1978	0.66170718226717623515583113324841358
1.30357 72690 34296 39125 ^{[Mw 40]}	Conway constant ^[41]		${\lambda }$	${\begin{smallmatrix}x^{71}\quad \ -x^{69}-2x^{68}-x^{67}+2x^{66}+2x^{65}+x^{64}-x^{63}-x^{62}-x^{61}-x^{60}\\-x^{59}+2x^{58}+5x^{57}+3x^{56}-2x^{55}-10x^{54}-3x^{53}-2x^{52}+6x^{51}+6x^{50}\\+x^{49}+9x^{48}-3x^{47}-7x^{46}-8x^{45}-8x^{44}+10x^{43}+6x^{42}+8x^{41}-5x^{40}\\-12x^{39}+7x^{38}-7x^{37}+7x^{36}+x^{35}-3x^{34}+10x^{33}+x^{32}-6x^{31}-2x^{30}\\-10x^{29}-3x^{28}+2x^{27}+9x^{26}-3x^{25}+14x^{24}-8x^{23}\quad \ -7x^{21}+9x^{20}\\+3x^{19}\!-4x^{18}\!-10x^{17}\!-7x^{16}\!+12x^{15}\!+7x^{14}\!+2x^{13}\!-12x^{12}\!-4x^{11}\!-2x^{10}\\+5x^{9}+x^{7}\quad \ -7x^{6}+7x^{5}-4x^{4}+12x^{3}-6x^{2}+3x-6\ =\ 0\quad \quad \quad \end{smallmatrix}}$		A	OEIS: A014715	[1;3,3,2,2,54,5,2,1,16,1,30,1,1,1,2,2,1,14,1,...]	1987	1.30357726903429639125709911215255189
1.18656 91104 15625 45282 ^{[Mw 41]}	Khinchin–Lévy constant^[42]		${\beta }$	${\frac {\pi ^{2}}{12\,\ln 2}}$	pi^2 /(12 ln 2)		OEIS: A100199	[1;5,2,1,3,1,1,28,18,16,3,2,6,2,6,1,1,5,5,9,...]	1935	1.18656911041562545282172297594723712
0.83564 88482 64721 05333	Baker constant ^[43]		$\beta _{3}$	$\int _{0}^{1}{\frac {\mathrm {d} t}{1+t^{3}}}=\sum _{n=0}^{\infty }{\frac {(-1)^{n}}{3n+1}}={\frac {1}{3}}\left(\ln 2+{\frac {\pi }{\sqrt {3}}}\right)$	Sum[n=0 to ∞] {((-1)^(n))/(3n+1)}		OEIS: A113476	[0;1,5,11,1,4,1,6,1,4,1,1,1,2,1,3,2,2,2,2,1,3,...]		0.83564884826472105333710345970011076
23.10344 79094 20541 6160 ^{[Mw 42]}	Kempner Serie(0) ^[44]		${K_{0}}$	$1{+}{\frac {1}{2}}{+}{\frac {1}{3}}{+}\cdots {+}{\frac {1}{9}}{+}{\frac {1}{11}}{+}\cdots {+}{\frac {1}{19}}{+}{\frac {1}{21}}{+}\cdots {+}\,{\text{etc.}}$ ${+}{\frac {1}{99}}{+}{\frac {1}{111}}{+}\cdots {+}{\frac {1}{119}}{+}{\frac {1}{121}}{+}\cdots \;\;{\overset {Excluding\;all}{\underset {containing\;0.}{\scriptstyle denominators}}}$	1+1/2+1/3+1/4+1/5 +1/6+1/7+1/8+1/9 +1/11+1/12+1/13 +1/14+1/15+...		OEIS: A082839	[23;9,1,2,3244,1,1,5,1,2,2,8,3,1,1,6,1,84,1,...]		23.1034479094205416160340540433255981
0.98943 12738 31146 95174 ^{[Mw 43]}	Lebesgue constant ^[45]		${C_{1}}$	$\lim _{n\to \infty }\!\!\left(\!{L_{n}{-}{\frac {4}{\pi ^{2}}}\ln(2n{+}1)}\!\!\right)\!{=}{\frac {4}{\pi ^{2}}}\!\left({\sum _{k=1}^{\infty }\!{\frac {2\ln k}{4k^{2}{-}1}}}{-}{\frac {\Gamma '({\tfrac {1}{2}})}{\Gamma ({\tfrac {1}{2}})}}\!\!\right)$	4/pi^2[(2 Sum[k=1 to ∞] {ln(k)/(4k^2-1)}) -poligamma(1/2)]		OEIS: A243277	[0;1,93,1,1,1,1,1,1,1,7,1,12,2,15,1,2,7,2,1,5,...]	?	0.98943127383114695174164880901886671
0.19452 80494 65325 11361 ^{[Mw 44]}	2nd du Bois-Reymond constant ^[46]		${C_{2}}$	${\frac {e^{2}-7}{2}}=\int _{0}^{\infty }\left\|{{\frac {d}{dt}}\left({\frac {\sin t}{t}}\right)^{n}}\right\|\,dt-1$	(e^2-7)/2	T	OEIS: A062546	[0;5,7,9,11,13,15,17,19,21,23,25,27,29,31,...] = [0;2p+3], p∈ℕ		0.19452804946532511361521373028750390
0.78853 05659 11508 96106 ^{[Mw 45]}	Lüroth constant^[47]		$C_{L}$	$\sum _{n=2}^{\infty }{\frac {\ln \left({\frac {n}{n-1}}\right)}{n}}$	Sum[n=2 to ∞] log(n/(n-1))/n		OEIS: A085361	[0;1,3,1,2,1,2,4,1,127,1,2,2,1,3,8,1,1,2,1,16,...]		0.78853056591150896106027632216944432
1.18745 23511 26501 05459 ^{[Mw 46]}	Foias constant _α ^[48]		$F_{\alpha }$	$x_{n+1}=\left(1+{\frac {1}{x_{n}}}\right)^{n}{\text{ for }}n=1,2,3,\ldots$ Foias constant is the unique real number such that if x1 = α then the sequence diverges to ∞. When x₁ = α, $\,\lim _{n\to \infty }x_{n}{\tfrac {\log n}{n}}=1$			OEIS: A085848	[1;5,2,1,81,3,2,2,1,1,1,1,1,6,1,1,3,1,1,4,3,2,...]	2000	1.18745235112650105459548015839651935
2.29316 62874 11861 03150 ^{[Mw 47]}	Foias constant _β		$F_{\beta }$	$x^{x+1}=(x+1)^{x}$	x^(x+1) = (x+1)^x		OEIS: A085846	[2;3,2,2,3,4,2,3,2,130,1,1,1,1,1,6,3,2,1,15,1,...]	2000	2.29316628741186103150802829125080586
0.82246 70334 24113 21823 ^{[Mw 48]}	Nielsen-Ramanujan constant ^[49]		${\frac {{\zeta }(2)}{2}}$	${\frac {\pi ^{2}}{12}}=\sum _{n=1}^{\infty }{\frac {(-1)^{n+1}}{n^{2}}}={\frac {1}{1^{2}}}{-}{\frac {1}{2^{2}}}{+}{\frac {1}{3^{2}}}{-}{\frac {1}{4^{2}}}{+}{\frac {1}{5^{2}}}{-}\cdots$	Sum[n=1 to ∞] {((-1)^(n+1))/n^2}	T	OEIS: A072691	[0;1,4,1,1,1,2,1,1,1,1,3,2,2,4,1,1,1,1,1,1,4...]	1909	0.82246703342411321823620758332301259
0.69314 71805 59945 30941 ^{[Mw 49]}	Natural logarithm of 2 ^[50]		$Ln(2)$	$\sum _{n=1}^{\infty }{\frac {1}{n2^{n}}}=\sum _{n=1}^{\infty }{\frac {({-}1)^{n+1}}{n}}={\frac {1}{1}}-{\frac {1}{2}}+{\frac {1}{3}}-{\frac {1}{4}}+{\cdots }$	Sum[n=1 to ∞] {(-1)^(n+1)/n}	T	OEIS: A002162	[0;1,2,3,1,6,3,1,1,2,1,1,1,1,3,10,1,1,1,2,1,1,...]	1550 to 1617	0.69314718055994530941723212145817657
0.47494 93799 87920 65033 ^{[Mw 50]}	Weierstrass constant ^[51]		$\sigma ({\tfrac {1}{2}})$	${\frac {e^{\frac {\pi }{8}}{\sqrt {\pi }}}{4*2^{3/4}{({\frac {1}{4}}!)^{2}}}}$	(E^(Pi/8) Sqrt[Pi]) /(4 2^(3/4) (1/4)!^2)		OEIS: A094692	[0;2,9,2,11,1,6,1,4,6,3,19,9,217,1,2,4,8,6...]	1872 ?	0.47494937998792065033250463632798297
0.57721 56649 01532 86060 ^{[Mw 51]}	Euler-Mascheroni constant		${\gamma }$	$\sum _{n=1}^{\infty }\sum _{k=0}^{\infty }{\frac {(-1)^{k}}{2^{n}+k}}=\sum _{n=1}^{\infty }\left({\frac {1}{n}}-\ln \left(1+{\frac {1}{n}}\right)\right)$ $=\int _{0}^{1}-\ln \left(\ln {\frac {1}{x}}\right)\,dx=-\Gamma '(1)=-\Psi (1)$	sum[n=1 to ∞] \|sum[k=0 to ∞] {((-1)^k)/(2^n+k)}		OEIS: A001620	[0;1,1,2,1,2,1,4,3,13,5,1,1,8,1,2,4,1,1,40,1,11,...]	1735	0.57721566490153286060651209008240243
1.38135 64445 18497 79337	Beta, Kneser-Mahler polynomial constant^[52]		$\beta$	$e^{^{\textstyle {\frac {2}{\pi }}\displaystyle {\int _{0}^{\frac {\pi }{3}}}\textstyle {t\tan t\ dt}}}=e^{^{\displaystyle {\,\int _{\frac {-1}{3}}^{\frac {1}{3}}}\textstyle {\,\ln \lfloor 1+e^{2\pi it}}\rfloor dt}}$	e^((PolyGamma(1,4/3) - PolyGamma(1,2/3) +9)/(4sqrt(3)Pi))		OEIS: A242710	[1;2,1,1,1,1,1,4,1,139,2,1,3,5,16,2,1,1,7,2,1,...]	1963	1.38135644451849779337146695685062412
1.35845 62741 82988 43520 ^{[Mw 52]}	Golden Spiral		$c$	$\varphi ^{\frac {2}{\pi }}=\left({\frac {1+{\sqrt {5}}}{2}}\right)^{\frac {2}{\pi }}$	GoldenRatio^(2/pi)		OEIS: A212224	[1;2,1,3,1,3,10,8,1,1,8,1,15,6,1,3,1,1,2,3,1,1,...]		1.35845627418298843520618060050187945
0.57595 99688 92945 43964 ^{[Mw 53]}	Stephens constant ^[53]		$C_{S}$	$\prod _{n=1}^{\infty }\left(1-{\frac {p}{p^{3}-1}}\right)$	Prod[n=1 to ∞] {1-hprime(n) /(hprime(n)^3-1)}	T ?	OEIS: A065478	[0;1,1,2,1,3,1,3,1,2,1,77,2,1,1,10,2,1,1,1,7,...]	?	0.57595996889294543964316337549249669
0.73908 51332 15160 64165 ^{[Mw 54]}	Dottie number ^[54]		$d$	$\lim _{x\to \infty }\cos ^{x}(c)=\lim _{x\to \infty }\underbrace {\cos(\cos(\cos(\cdots (\cos(c)))))} _{x}$	cos(c)=c		OEIS: A003957	[0;1,2,1,4,1,40,1,9,4,2,1,15,2,12,1,21,1,17,...]	?	0.73908513321516064165531208767387340
0.67823 44919 17391 97803 ^{[Mw 55]}	Taniguchi constant ^[55]		$C_{T}$	$\prod _{n=1}^{\infty }\left(1-{\frac {3}{{p_{n}}^{3}}}+{\frac {2}{{p_{n}}^{4}}}+{\frac {1}{{p_{n}}^{5}}}-{\frac {1}{{p_{n}}^{6}}}\right)$ $\scriptstyle p_{n}=\,{\text{prime}}$	Prod[n=1 to ∞] {1 -3/ithprime(n)^3 +2/ithprime(n)^4 +1/ithprime(n)^5 -1/ithprime(n)^6}	T ?	OEIS: A175639	[0;1,2,9,3,1,2,9,11,1,13,2,15,1,1,1,2,4,1,1,1,...]	?	0.67823449191739197803553827948289481
1.85407 46773 01371 91843 ^{[Mw 56]}	Gauss' Lemniscate constant^[56]		$L{\text{/}}{\sqrt {2}}$	$\int \limits _{0}^{\infty }{\frac {\mathrm {d} x}{\sqrt {1+x^{4}}}}={\frac {1}{4{\sqrt {\pi }}}}\,\Gamma \left({\frac {1}{4}}\right)^{2}={\frac {4\left({\frac {1}{4}}!\right)^{2}}{\sqrt {\pi }}}$ $\scriptstyle \Gamma (){\text{= Gamma function}}$	pi^(3/2)/(2 Gamma(3/4)^2)		OEIS: A093341	[1;1,5,1,5,1,3,1,6,2,1,4,16,3,112,2,1,1,18,1,...]		1.85407467730137191843385034719526005
1.75874 36279 51184 82469	Infinite product constant, with Alladi-Grinstead ^[57]		$Pr_{1}$	$\prod _{n=2}^{\infty }{\Big (}1+{\frac {1}{n}}{\Big )}^{\frac {1}{n}}$	Prod[n=2 to inf] {(1+1/n)^(1/n)}		OEIS: A242623	[1;1,3,6,1,8,1,4,3,1,4,1,1,1,6,5,2,40,1,387,2,...]	1977	1.75874362795118482469989684865589317
1.86002 50792 21190 30718	Spiral of Theodorus ^[58]		$\partial$	$\sum _{n=1}^{\infty }{\frac {1}{{\sqrt {n^{3}}}+{\sqrt {n}}}}=\sum _{n=1}^{\infty }{\frac {1}{{\sqrt {n}}(n+1)}}$	Sum[n=1 to ∞] {1/(n^(3/2) +n^(1/2))}		OEIS: A226317	[1;1,6,6,1,15,11,5,1,1,1,1,5,3,3,3,2,1,1,2,19,...]	-460 to -399	1.86002507922119030718069591571714332
2.79128 78474 77920 00329	Nested radical S₅		$S_{5}$	$\displaystyle {\frac {{\sqrt {21}}+1}{2}}=\scriptstyle \,{\sqrt {5+{\sqrt {5+{\sqrt {5+{\sqrt {5+{\sqrt {5+\cdots }}}}}}}}}}\;$ $=1+\,\scriptstyle {\sqrt {5-{\sqrt {5-{\sqrt {5-{\sqrt {5-{\sqrt {5-\cdots }}}}}}}}}}\;$	(sqrt(21)+1)/2	A	A222134	[2;1,3,1,3,1,3,1,3,1,3,1,3,1,3,1,3,1,3,1,3,1,3,...] [2;1,3]	?	2.79128784747792000329402359686400424
0.70710 67811 86547 52440 +0.70710 67811 86547 524 i ^{[Mw 57]}	Square root of i ^[59]		${\sqrt {i}}$	${\sqrt[{4}]{-1}}={\frac {1+i}{\sqrt {2}}}=e^{\frac {i\pi }{4}}=\cos \left({\frac {\pi }{4}}\right)+i\sin \left({\frac {\pi }{4}}\right)$	(1+i)/(sqrt 2)	C A	OEIS: A010503	[0;1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,..] = [0;1,2,...] [0;1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,..] i = [0;1,2,...] i	?	0.70710678118654752440084436210484903 + 0.70710678118654752440084436210484 i
0.80939 40205 40639 13071 ^{[Mw 58]}	Alladi–Grinstead constant ^[60]		${{\mathcal {A}}_{AG}}$	$e^{-1+\sum \limits _{k=2}^{\infty }\sum \limits _{n=1}^{\infty }{\frac {1}{nk^{n+1}}}}=e^{-1-\sum \limits _{k=2}^{\infty }{\frac {1}{k}}\ln \left(1-{\frac {1}{k}}\right)}$	e^{(sum[k=2 to ∞] \|sum[n=1 to ∞] {1/(n k^(n+1))})-1}		OEIS: A085291	[0;1,4,4,17,4,3,2,5,3,1,1,1,1,6,1,1,2,1,22,...]	1977	0.80939402054063913071793188059409131
2.58498 17595 79253 21706 ^{[Mw 59]}	Sierpiński's constant ^[61]		${K}$	$\pi \left(2\gamma +\ln {\frac {4\pi ^{3}}{\Gamma ({\tfrac {1}{4}})^{4}}}\right)=\pi (2\gamma +4\ln \Gamma ({\tfrac {3}{4}})-\ln \pi )$ $=\pi \left(2\ln 2+3\ln \pi +2\gamma -4\ln \Gamma ({\tfrac {1}{4}})\right)$	-Pi Log[Pi]+2 Pi EulerGamma +4 Pi Log [Gamma[3/4]]		OEIS: A062089	[2;1,1,2,2,3,1,3,1,9,2,8,4,1,13,3,1,15,18,1,...]	1907	2.58498175957925321706589358738317116
1.73245 47146 00633 47358 ^{[Ow 1]}	Reciprocal of the Euler–Mascheroni constant		${\frac {1}{\gamma }}$	$\left(\int _{0}^{1}-\log \left(\log {\frac {1}{x}}\right)\,dx\right)^{-1}=\sum _{n=1}^{\infty }(-1)^{n}(-1+\gamma )^{n}$	1/Integrate_ {x=0 to 1} -log(log(1/x))		OEIS: A098907	[1;1,2,1,2,1,4,3,13,5,1,1,8,1,2,4,1,1,40,1,11,...]		1.73245471460063347358302531586082968
1.43599 11241 76917 43235 ^{[Mw 60]}	Lebesgue constant (interpolation) ^[62]^[63]		${L_{1}}$	$\prod _{\begin{smallmatrix}i=0\\j\neq i\end{smallmatrix}}^{n}{\frac {x-x_{i}}{x_{j}-x_{i}}}={\frac {1}{\pi }}\int _{0}^{\pi }{\frac {\lfloor \sin {\frac {3t}{2}}\rfloor }{\sin {\frac {t}{2}}}}\,dt={\frac {1}{3}}+{\frac {2{\sqrt {3}}}{\pi }}$	1/3 + 2*sqrt(3)/pi	T	OEIS: A226654	[1;2,3,2,2,6,1,1,1,1,4,1,7,1,1,1,2,1,3,1,2,1,1,...]	1902 ~	1.43599112417691743235598632995927221
3.24697 96037 17467 06105 ^{[Mw 61]}	Silver root Tutte–Beraha constant ^[64]		$\varsigma$	$2+2\cos {\frac {2\pi }{7}}=\textstyle 2+{\frac {2+{\sqrt[{3}]{7+7{\sqrt[{3}]{7+7{\sqrt[{3}]{\,7+\cdots }}}}}}}{1+{\sqrt[{3}]{7+7{\sqrt[{3}]{7+7{\sqrt[{3}]{\,7+\cdots }}}}}}}}$	2+2 cos(2Pi/7)	A	OEIS: A116425	[3;4,20,2,3,1,6,10,5,2,2,1,2,2,1,18,1,1,3,2,...]		3.24697960371746706105000976800847962
1.94359 64368 20759 20505 ^{[Mw 62]}	Euler Totient constant ^[65]^[66]		$ET$	${\underset {p{\text{= primes}}}{\prod _{p}{\Big (}1+{\frac {1}{p(p-1)}}{\Big )}}}={\frac {\zeta (2)\zeta (3)}{\zeta (6)}}={\frac {315\zeta (3)}{2\pi ^{4}}}$	zeta(2)*zeta(3) /zeta(6)		OEIS: A082695	[1;1,16,1,2,1,2,3,1,1,3,2,1,8,1,1,1,1,1,1,1,32,...]	1750	1.94359643682075920505707036257476343
1.49534 87812 21220 54191	Fourth root of five ^[67]		${\sqrt[{4}]{5}}$	${\sqrt[{5}]{5\,{\sqrt[{5}]{5\,{\sqrt[{5}]{5\,{\sqrt[{5}]{5\,{\sqrt[{5}]{5\,\cdots }}}}}}}}}}$	(5(5(5(5(5(5(5) ^1/5)^1/5)^1/5) ^1/5)^1/5)^1/5) ^1/5 ...	I	OEIS: A011003	[1;2,53,4,96,2,1,6,2,2,2,6,1,4,1,49,17,2,3,2,...]		1.49534878122122054191189899414091339
0.87228 40410 65627 97617 ^{[Mw 63]}	Area of Ford circle ^[68]		$A_{CF}$	$\sum _{q\geq 1}\sum _{(p,q)=1 \atop 1\leq p<q}\pi \left({\frac {1}{2q^{2}}}\right)^{2}{\underset {\zeta (){\text{= Riemann Zeta Function}}}{={\frac {\pi }{4}}{\frac {\zeta (3)}{\zeta (4)}}={\frac {45}{2}}{\frac {\zeta (3)}{\pi ^{3}}}}}$	pi Zeta(3) /(4 Zeta(4))			[0;1,6,1,4,1,7,5,36,3,29,1,1,10,3,2,8,1,1,1,3,...]		0.87228404106562797617519753217122587
1.08232 32337 11138 19151 ^{[Mw 64]}	Zeta(4) ^[69]		$\zeta (4)$	${\frac {\pi ^{4}}{90}}=\sum _{n=1}^{\infty }{\frac {1}{n^{4}}}={\frac {1}{1^{4}}}+{\frac {1}{2^{4}}}+{\frac {1}{3^{4}}}+{\frac {1}{4^{4}}}+{\frac {1}{5^{4}}}+...$	Sum[n=1 to ∞] {1/n^4}	T	OEIS: A013662	[1;12,6,1,3,1,4,183,1,1,2,1,3,1,1,5,4,2,7,23,...]	?	1.08232323371113819151600369654116790
1.56155 28128 08830 27491	Triangular root of 2.^[70]		${R_{2}}$	${\frac {{\sqrt {17}}-1}{2}}=\,\scriptstyle {\sqrt {4+{\sqrt {4+{\sqrt {4+{\sqrt {4+{\sqrt {4+{\sqrt {4+\cdots }}}}}}}}}}}}\,\,-1$ $=\,\scriptstyle {\sqrt {4-{\sqrt {4-{\sqrt {4-{\sqrt {4-{\sqrt {4-{\sqrt {4-\cdots }}}}}}}}}}}}\textstyle$	(sqrt(17)-1)/2	A	OEIS: A222133	[1;1,1,3,1,1,3,1,1,3,1,1,3,1,1,3,1,1,3,1,1,3,1,...] [1;1,1,3]		1.56155281280883027491070492798703851
9.86960 44010 89358 61883	Pi Squared		${\pi }^{2}$	$6\,\zeta (2)=6\sum _{n=1}^{\infty }{\frac {1}{n^{2}}}={\frac {6}{1^{2}}}+{\frac {6}{2^{2}}}+{\frac {6}{3^{2}}}+{\frac {6}{4^{2}}}+\cdots$	6 Sum[n=1 to ∞] {1/n^2}	T	A002388	[9;1,6,1,2,47,1,8,1,1,2,2,1,1,8,3,1,10,5,1,3,...]		9.86960440108935861883449099987615114
1.32471 79572 44746 02596 ^{[Mw 65]}	Plastic number ^[71]		${\rho }$	${\sqrt[{3}]{1+\!{\sqrt[{3}]{1+\!{\sqrt[{3}]{1+\cdots }}}}}}=\textstyle {\sqrt[{3}]{{\frac {1}{2}}+\!{\sqrt {\frac {23}{108}}}}}+\!{\sqrt[{3}]{{\frac {1}{2}}-\!{\sqrt {\frac {23}{108}}}}}$	(1+(1+(1+(1+(1+(1 )^(1/3))^(1/3))^(1/3)) ^(1/3))^(1/3))^(1/3)	A	OEIS: A060006	[1;3,12,1,1,3,2,3,2,4,2,141,80,2,5,1,2,8,2,...]	1929	1.32471795724474602596090885447809734
2.37313 82208 31250 90564	Lévy ₂ constant ^[72]		$2\,ln\,\gamma$	${\frac {\pi ^{2}}{6ln(2)}}$	Pi^(2)/(6*ln(2))	T	OEIS: A174606	[2;2,1,2,8,57,9,32,1,1,2,1,2,1,2,1,2,1,3,2,...]	1936	2.37313822083125090564344595189447424
0.85073 61882 01867 26036 ^{[Mw 66]}	Regular paperfolding sequence ^[73]^[74]		${P_{f}}$	$\sum _{n=0}^{\infty }{\frac {8^{2^{n}}}{2^{2^{n+2}}-1}}=\sum _{n=0}^{\infty }{\cfrac {\tfrac {1}{2^{2^{n}}}}{1-{\tfrac {1}{2^{2^{n+2}}}}}}$	N[Sum[n=0 to ∞] {8^2^n/(2^2^ (n+2)-1)},37]		OEIS: A143347	[0;1,5,1,2,3,21,1,4,107,7,5,2,1,2,1,1,2,1,6,...]		0.85073618820186726036779776053206660
1.15636 26843 32269 71685 ^{[Mw 67]}	Cubic recurrence constant ^[75]^[76]		${\sigma _{3}}$	$\prod _{n=1}^{\infty }n^{{3}^{-n}}={\sqrt[{3}]{1{\sqrt[{3}]{2{\sqrt[{3}]{3\cdots }}}}}}=1^{1/3}\;2^{1/9}\;3^{1/27}\cdots$	prod[n=1 to ∞] {n ^(1/3)^n}		OEIS: A123852	[1;6,2,1,1,8,13,1,3,2,2,6,2,1,2,1,1,1,10,33,...]		1.15636268433226971685337032288736935
1.26185 95071 42914 87419 ^{[Mw 68]}	Fractal dimension of the Koch snowflake ^[77]		${C_{k}}$	${\frac {\log 4}{\log 3}}$	log(4)/log(3)	I	A100831	[1;3,1,4,1,1,11,1,46,1,5,112,1,1,1,1,1,3,1,7,...]		1.26185950714291487419905422868552171
6.58088 59910 17920 97085	Froda constant^[78]		$2^{\,e}$	$2^{e}$	2^e			[6;1,1,2,1,1,2,3,1,14,11,4,3,1,1,7,5,5,2,7,...]		6.58088599101792097085154240388648649
0.26149 72128 47642 78375 ^{[Mw 69]}	Meissel-Mertens constant ^[79]		${M}$	$\lim _{n\rightarrow \infty }\!\!\left(\sum _{p\leq n}{\frac {1}{p}}\!-\ln(\ln(n))\!\right)\!\!={\underset {\!\!\!\!\gamma :\,{\text{Euler constant}},\,\,p:\,{\text{prime}}}{\!\gamma \!+\!\!\sum _{p}\!\left(\!\ln \!\left(\!1\!-\!{\frac {1}{p}}\!\right)\!\!+\!{\frac {1}{p}}\!\right)}}$	gamma+ Sum[n=1 to ∞] {ln(1-1/prime(n)) +1/prime(n)}	T ?	OEIS: A077761	[0;3,1,4,1,2,5,2,1,1,1,1,13,4,2,4,2,1,33,296,...]	1866 & 1873	0.26149721284764278375542683860869585
4.81047 73809 65351 65547	John constant ^[80]		$\gamma$	${\sqrt[{i}]{i}}=i^{-i}=(i^{i})^{-1}=(((i)^{i})^{i})^{i}=e^{\frac {\pi }{2}}={\sqrt {\sum _{n=0}^{\infty }{\frac {\pi ^{n}}{n!}}}}$	e^(π/2)	T	OEIS: A042972	[4;1,4,3,1,1,1,1,1,1,1,1,7,1,20,1,3,6,10,3,2,...]		4.81047738096535165547303566670383313
-0.5 ± 0.86602 54037 84438 64676 i	Cube Root of 1 ^[81]		${\sqrt[{3}]{1}}$	${\begin{cases}\ \ 1\\-{\frac {1}{2}}+{\frac {\sqrt {3}}{2}}i\\-{\frac {1}{2}}-{\frac {\sqrt {3}}{2}}i.\end{cases}}$	1, E^(2i pi/3), E^(-2i pi/3)	C	OEIS: A010527	- [0,5] ± [0;1,6,2,6,2,6,2,6,2,6,2,6,2,6,2,6,2,6,2,...] i - [0,5] ± [0; 1, 6, 2] i		- 0.5 ± 0.8660254037844386467637231707529 i
0.11000 10000 00000 00000 0001 ^{[Mw 70]}	Liouville number ^[82]		${\text{£}}_{Li}$	$\sum _{n=1}^{\infty }{\frac {1}{10^{n!}}}={\frac {1}{10^{1!}}}+{\frac {1}{10^{2!}}}+{\frac {1}{10^{3!}}}+{\frac {1}{10^{4!}}}+\cdots$	Sum[n=1 to ∞] {10^(-n!)}	T	OEIS: A012245	[1;9,1,999,10,9999999999999,1,9,999,1,9]		0.11000100000000000000000100...
0.06598 80358 45312 53707 ^{[Mw 71]}	Lower limit of Tetration ^[83]		${e}^{-e}$	$\left({\frac {1}{e}}\right)^{e}$	1/(e^e)		OEIS: A073230	[0;15,6,2,13,1,3,6,2,1,1,5,1,1,1,9,4,1,1,1,...]		0.06598803584531253707679018759684642
1.83928 67552 14161 13255	Tribonacci constant^[84]		${\phi _{}}_{3}$	$\textstyle {\frac {1+{\sqrt[{3}]{19+3{\sqrt {33}}}}+{\sqrt[{3}]{19-3{\sqrt {33}}}}}{3}}=\scriptstyle \,1+\left({\sqrt[{3}]{{\tfrac {1}{2}}+{\sqrt[{3}]{{\tfrac {1}{2}}+{\sqrt[{3}]{{\tfrac {1}{2}}+...}}}}}}\right)^{-1}$	(1/3)(1+(19+3 sqrt(33))^(1/3) +(19-3 *sqrt(33))^(1/3))	A	OEIS: A058265	[1;1,5,4,2,305,1,8,2,1,4,6,14,3,1,13,5,1,7,...]		1.83928675521416113255185256465328660
0.36651 29205 81664 32701	Median of the Gumbel distribution ^[85]		${ll_{2}}$	$-\ln(\ln(2))$	-ln(ln(2))		A074785	[0;2,1,2,1,2,6,1,6,6,2,2,2,1,12,1,8,1,1,3,1,...]		0.36651292058166432701243915823266947
36.46215 96072 07911 7709	Pi^pi ^[86]		$\pi ^{\pi }$	$\pi ^{\pi }$	pi^pi		OEIS: A073233	[36;2,6,9,2,1,2,5,1,1,6,2,1,291,1,38,50,1,2,...]		36.4621596072079117709908260226921236
0.53964 54911 90413 18711	Ioachimescu constant ^[87]		$2+\zeta ({\tfrac {1}{2}})$	${2{-}(1{+}{\sqrt {2}})\sum _{n=1}^{\infty }{\frac {(-1)^{n+1}}{\sqrt {n}}}}=\gamma +\sum _{n=1}^{\infty }{\frac {(-1)^{2n}\;\gamma _{n}}{2^{n}n!}}$	γ +N[ sum[n=1 to ∞] {((-1)^(2n) gamma_n) /(2^n n!)}]		2- OEIS: A059750	[0;1,1,5,1,4,6,1,1,2,6,1,1,2,1,1,1,37,3,2,1,...]		0.53964549119041318711050084748470198
15.15426 22414 79264 1897 ^{[Mw 72]}	Exponential reiterated constant ^[88]		$e^{e}$	$\sum _{n=0}^{\infty }{\frac {e^{n}}{n!}}=\lim _{n\to \infty }\left({\frac {1+n}{n}}\right)^{n^{-n}(1+n)^{1+n}}$	Sum[n=0 to ∞] {(e^n)/n!}		OEIS: A073226	[15;6,2,13,1,3,6,2,1,1,5,1,1,1,9,4,1,1,1,6,7,...]		15.1542622414792641897604302726299119
0.64624 54398 94813 30426 ^{[Mw 73]}	Masser–Gramain constant ^[89]		${C}$	$\gamma {\beta }(1)\!+\!{\beta }'(1)\!=\pi \!\left(-\!\ln \Gamma ({\tfrac {1}{4}})+{\tfrac {3}{4}}\pi +{\tfrac {1}{2}}\ln 2+{\tfrac {1}{2}}\gamma \right)$ $=\pi \!\left(-\!\ln({\tfrac {1}{4}}!)+{\tfrac {3}{4}}\ln \pi -{\tfrac {3}{2}}\ln 2+{\tfrac {1}{2}}\,\gamma \right)$ $\scriptstyle \gamma ={\text{Euler–Mascheroni constant}}=0.5772156649\ldots$ $\scriptstyle \beta ()={\text{Beta function}},\quad \scriptstyle \Gamma ()={\text{Gamma function}}$	Pi/4(2Gamma + 2Log[2] + 3Log[Pi]- 4 Log[Gamma[1/4]])		OEIS: A086057	[0;1,1,1,4,1,3,2,3,9,1,33,1,4,3,3,5,3,1,3,4,...]		0.64624543989481330426647339684579279
1.11072 07345 39591 56175 ^{[Mw 74]}	The ratio of a square and circle circumscribed ^[90]		${\frac {\pi }{2{\sqrt {2}}}}$	$\sum _{n=1}^{\infty }{\frac {({-}1)^{\lfloor {\frac {n-1}{2}}\rfloor }}{2n+1}}={\frac {1}{1}}+{\frac {1}{3}}-{\frac {1}{5}}-{\frac {1}{7}}+{\frac {1}{9}}+{\frac {1}{11}}-{\cdots }$	sum[n=1 to ∞] {(-1)^(floor( (n-1)/2)) /(2n-1)}	T	OEIS: A093954	[1;9,31,1,1,17,2,3,3,2,3,1,1,2,2,1,4,9,1,3,...]		1.11072073453959156175397024751517342
1.45607 49485 82689 67139 ^{[Mw 75]}	Backhouse's constant ^[91]		${B}$	$\lim _{k\to \infty }\left\|{\frac {q_{k+1}}{q_{k}}}\right\vert \quad \scriptstyle {\text{where:}}\displaystyle \;\;Q(x)={\frac {1}{P(x)}}=\!\sum _{k=1}^{\infty }q_{k}x^{k}$ $P(x)=\sum _{k=1}^{\infty }{\underset {p_{k}{\text{ prime}}}{p_{k}x^{k}}}=1+2x+3x^{2}+5x^{3}+\cdots$	1/( FindRoot[0 == 1 + Sum[x^n Prime[n], {n, 10000}], {x, {1}})		OEIS: A072508	[1;2,5,5,4,1,1,18,1,1,1,1,1,2,13,3,1,2,4,16,...]	1995	1.45607494858268967139959535111654355
1.85193 70519 82466 17036 ^{[Mw 76]}	Gibbs constant ^[92]		${Si(\pi )}$ Sin integral	$\int _{0}^{\pi }{\frac {\sin t}{t}}\,dt=\sum \limits _{n=1}^{\infty }(-1)^{n-1}{\frac {\pi ^{2n-1}}{(2n-1)(2n-1)!}}$ $=\pi -{\frac {\pi ^{3}}{3\cdot 3!}}+{\frac {\pi ^{5}}{5\cdot 5!}}-{\frac {\pi ^{7}}{7\cdot 7!}}+\cdots$	SinIntegral[Pi]		OEIS: A036792	[1;1,5,1,3,15,1,5,3,2,7,2,1,62,1,3,110,1,39,...]		1.85193705198246617036105337015799136
0.23571 11317 19232 93137 ^{[Mw 77]}	Copeland–Erdős constant ^[93]		${{\mathcal {C}}_{CE}}$	$\sum _{n=1}^{\infty }{\frac {p_{n}}{10^{n+\sum \limits _{k=1}^{n}\lfloor \log _{10}{p_{k}}\rfloor }}}$	sum[n=1 to ∞] {prime(n) /(n+(10^ sum[k=1 to n]{floor (log_10 prime(k))}))}	A	OEIS: A033308	[0;4,4,8,16,18,5,1,1,1,1,7,1,1,6,2,9,58,1,3,...]		0.23571113171923293137414347535961677
1.52362 70862 02492 10627 ^{[Mw 78]}	Fractal dimension of the boundary of the dragon curve ^[94]		${C_{d}}$	${\frac {\log \left({\frac {1+{\sqrt[{3}]{73-6{\sqrt {87}}}}+{\sqrt[{3}]{73+6{\sqrt {87}}}}}{3}}\right)}{\log(2)}}$	(log((1+(73-6 sqrt(87))^1/3+ (73+6 sqrt(87))^1/3) /3))/ log(2)))			[1;1,1,10,12,2,1,149,1,1,1,3,11,1,3,17,4,1,...]		1.52362708620249210627768393595421662
1.78221 39781 91369 11177 ^{[Mw 79]}	Grothendieck constant ^[95]		${K_{R}}$	${\frac {\pi }{2\log(1+{\sqrt {2}})}}$	pi/(2 log(1+sqrt(2)))		OEIS: A088367	[1;1,3,1,1,2,4,2,1,1,17,1,12,4,3,5,10,1,1,3,...]		1.78221397819136911177441345297254934
1.58496 25007 21156 18145 ^{[Mw 80]}	Hausdorff dimension, Sierpinski triangle ^[96]		${log_{2}3}$	${\frac {\log 3}{\log 2}}={\frac {\sum _{n=0}^{\infty }{\frac {1}{2^{2n+1}(2n+1)}}}{\sum _{n=0}^{\infty }{\frac {1}{3^{2n+1}(2n+1)}}}}={\frac {{\frac {1}{2}}+{\frac {1}{24}}+{\frac {1}{160}}+\cdots }{{\frac {1}{3}}+{\frac {1}{81}}+{\frac {1}{1215}}+\cdots }}$	( Sum[n=0 to ∞] {1/ (2^(2n+1) (2n+1))})/ (Sum[n=0 to ∞] {1/ (3^(2n+1) (2n+1))})	T	OEIS: A020857	[1;1,1,2,2,3,1,5,2,23,2,2,1,1,55,1,4,3,1,1,...]		1.58496250072115618145373894394781651
1.30637 78838 63080 69046 ^{[Mw 81]}	Mills' constant ^[97]		${\theta }$	$\lfloor A^{3^{n}}\rfloor$	Nest[ NextPrime[#^3] &, 2, 7]^(1/3^8)		OEIS: A051021	[1;3,3,1,3,1,2,1,2,1,4,2,35,21,1,4,4,1,1,3,2,...]	1947	1.30637788386308069046861449260260571
2.02988 32128 19307 25004 ^{[Mw 82]}	Figure eight knot hyperbolic volume ^[98]		${V_{8}}$	$2{\sqrt {3}}\,\sum _{n=1}^{\infty }{\frac {1}{n{2n \choose n}}}\sum _{k=n}^{2n-1}{\frac {1}{k}}=6\int \limits _{0}^{\pi /3}\log \left({\frac {1}{2\sin t}}\right)\,dt=$ $\scriptstyle {\frac {\sqrt {3}}{9}}\,\sum \limits _{n=0}^{\infty }{\frac {(-1)^{n}}{27^{n}}}\,\left\{\!{\frac {18}{(6n+1)^{2}}}-{\frac {18}{(6n+2)^{2}}}-{\frac {24}{(6n+3)^{2}}}-{\frac {6}{(6n+4)^{2}}}+{\frac {2}{(6n+5)^{2}}}\!\right\}$	6 integral[0 to pi/3] {log(1/(2 sin (n)))}		OEIS: A091518	[2;33,2,6,2,1,2,2,5,1,1,7,1,1,1,113,1,4,5,1,...]		2.02988321281930725004240510854904057
262 53741 26407 68743 .99999 99999 99250 073 ^{[Mw 83]}	Hermite–Ramanujan constant^[99]		${R}$	$e^{\pi {\sqrt {163}}}$	e^(π sqrt(163))	T	OEIS: A060295	[262537412640768743;1,1333462407511,1,8,1,1,5,...]	1859	262537412640768743.999999999999250073
1.74540 56624 07346 86349 ^{[Mw 84]}	Khinchin harmonic mean ^[100]		${K_{-1}}$	${\frac {\log 2}{\sum \limits _{n=1}^{\infty }{\frac {1}{n}}\log {\bigl (}1{+}{\frac {1}{n(n+2)}}{\bigr )}}}=\lim _{n\to \infty }{\frac {n}{{\frac {1}{a_{1}}}+{\frac {1}{a_{2}}}+\cdots +{\frac {1}{a_{n}}}}}$ a₁ ... a_n are elements of a continued fraction [a₀; a₁, a₂, ..., a_n]	(log 2)/ (sum[n=1 to ∞] {1/n log(1+ 1/(n(n+2))}		OEIS: A087491	[1;1,2,1,12,1,5,1,5,13,2,13,2,1,9,1,6,1,3,1,...]		1.74540566240734686349459630968366106
1.64872 12707 00128 14684 ^{[Ow 2]}	Square root of the number e ^[101]		${\sqrt {e}}$	$\sum _{n=0}^{\infty }{\frac {1}{2^{n}n!}}=\sum _{n=0}^{\infty }{\frac {1}{(2n)!!}}={\frac {1}{1}}+{\frac {1}{2}}+{\frac {1}{8}}+{\frac {1}{48}}+\cdots$	Sum[n=0 to ∞] {1/(2^n n!)}	T	OEIS: A019774	[1;1,1,1,5,1,1,9,1,1,13,1,1,17,1,1,21,1,1,...] = [1;1,1,1,4p+1], p∈ℕ		1.64872127070012814684865078781416357
1.01734 30619 84449 13971 ^{[Mw 85]}	Zeta(6) ^[102]		$\zeta (6)$	${\frac {\pi ^{6}}{945}}\!=\!\prod _{n=1}^{\infty }\!{\underset {p_{n}:{\text{ prime}}}{\frac {1}{{1-p_{n}}^{-6}}}}={\frac {1}{1\!-\!2^{-6}}}\!\cdot \!{\frac {1}{1\!-\!3^{-6}}}\!\cdot \!{\frac {1}{1\!-\!5^{-6}}}\cdots$	Prod[n=1 to ∞] {1/(1-ithprime (n)^-6)}	T	OEIS: A013664	[1;57,1,1,1,15,1,6,3,61,1,5,3,1,6,1,3,3,6,1,...]		1.01734306198444913971451792979092052
0.10841 01512 23111 36151 ^{[Mw 86]}	Trott constant ^[103]		$\mathrm {T} _{1}$	$\textstyle [1,0,8,4,1,0,1,5,1,2,2,3,1,1,1,3,6,...]$ ${\tfrac {1}{1+{\tfrac {1}{0+{\tfrac {1}{8+{\tfrac {1}{4+{\tfrac {1}{1+{\tfrac {1}{0+1{/\cdots }}}}}}}}}}}}}$	Trott Constant		OEIS: A039662	[0;9,4,2,5,1,2,2,3,1,1,1,3,6,1,5,1,1,2,...]		0.10841015122311136151129081140641509
0.00787 49969 97812 3844 ^{[Mw 87]}	Chaitin constant ^[104]		$\Omega$	$\sum _{p\in P}2^{-\|p\|}{\overset {p:{\text{ Halted program}}}{\underset {P:{\text{ Domain of all programs that stop.}}}{\scriptstyle {\|p\|}:{\text{Size in bits of program }}p}}}$ See also: Halting problem		T	OEIS: A100264	[0; 126, 1, 62, 5, 5, 3, 3, 21, 1, 4, 1]	1975	0.0078749969978123844
0.83462 68416 74073 18628 ^{[Mw 88]}	Gauss constant ^[105]		${G}$	${\frac {1}{\mathrm {agm} (1,{\sqrt {2}})}}={\frac {4{\sqrt {2}}\,({\tfrac {1}{4}}!)^{2}}{\pi ^{3/2}}}={\frac {2}{\pi }}\int _{0}^{1}{\frac {dx}{\sqrt {1-x^{4}}}}$ AGM = Arithmetic–geometric mean	(4 sqrt(2)((1/4)!)^2) /pi^(3/2)	T	OEIS: A014549	[0;1,5,21,3,4,14,1,1,1,1,1,3,1,15,1,3,7,1,...]		0.83462684167407318628142973279904680
1.45136 92348 83381 05028 ^{[Mw 89]}	Ramanujan–Soldner constant^[106]^[107]		${\mu }$	$\mathrm {li} (x)=\int \limits _{0}^{x}{\frac {dt}{\ln t}}=0{\color {White}{......}}$ li = Logarithmic integral $\mathrm {li} (x)\;=\;\mathrm {Ei} (\ln {x}){\color {White}{........}}$ Ei = Exponential integral	FindRoot[li(x) = 0]	I	OEIS: A070769	[1;2,4,1,1,1,3,1,1,1,2,47,2,4,1,12,1,1,2,2,1,...]	1792 to 1809	1.45136923488338105028396848589202744
0.64341 05462 88338 02618 ^{[Mw 90]}	Cahen's constant ^[108]		$\xi _{2}$	$\sum _{k=1}^{\infty }{\frac {(-1)^{k}}{s_{k}-1}}={\frac {1}{1}}-{\frac {1}{2}}+{\frac {1}{6}}-{\frac {1}{42}}+{\frac {1}{1806}}{\,\pm \cdots }$ Where s_k is the kth term of Sylvester's sequence 2, 3, 7, 43, 1807, ... Defined as: $\,\,S_{0}=\,2,\,\,S_{k}=\,1+\prod \limits _{n=0}^{k-1}S_{n}{\text{ for}}\;k>0$		T	OEIS: A080130	[0; 1, 1, 1, 4, 9, 196, 16641, 639988804, ...]	1891	0.64341054628833802618225430775756476
1.41421 35623 73095 04880 ^{[Mw 91]}	Square root of 2, Pythagoras constant.^[109]		${\sqrt {2}}$	$\!\prod _{n=1}^{\infty }\!\left(1\!+\!{\frac {(-1)^{n+1}}{2n-1}}\right)\!=\!\left(1\!+\!{\frac {1}{1}}\right)\!\left(1\!-\!{\frac {1}{3}}\right)\!\left(1\!+\!{\frac {1}{5}}\right)\cdots$	prod[n=1 to ∞] {1+(-1)^(n+1) /(2n-1)}	A	OEIS: A002193	[1;2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,...] = [1;2...]		1.41421356237309504880168872420969808
1.77245 38509 05516 02729 ^{[Mw 92]}	Carlson–Levin constant ^[110]		${\Gamma }({\tfrac {1}{2}})$	${\sqrt {\pi }}=\left(-{\frac {1}{2}}\right)!=\int _{-\infty }^{\infty }{\frac {1}{e^{x^{2}}}}\,dx=\int _{0}^{1}{\frac {1}{\sqrt {-\ln x}}}\,dx$	sqrt (pi)	T	OEIS: A002161	[1;1,3,2,1,1,6,1,28,13,1,1,2,18,1,1,1,83,1,...]		1.77245385090551602729816748334114518
1.05946 30943 59295 26456 ^{[Ow 3]}	Musical interval between each half tone ^[111]^[112]		${\sqrt[{12}]{2}}$	$\scriptstyle 440\,Hz.\textstyle 2^{\frac {1}{12}}\,2^{\frac {2}{12}}\,2^{\frac {3}{12}}\,2^{\frac {4}{12}}\,2^{\frac {5}{12}}\,2^{\frac {6}{12}}\,2^{\frac {7}{12}}\,2^{\frac {8}{12}}\,2^{\frac {9}{12}}\,2^{\frac {10}{12}}\,2^{\frac {11}{12}}\,2$ $\scriptstyle {\color {white}...\color {black}Do_{1}\;\;Do\#\;\,Re\;\,Re\#\;\,Mi\;\;Fa\;\;Fa\#\;Sol\;\,Sol\#\,La\;\;La\#\;\;Si\;\,Do_{2}}$ $\scriptstyle {\color {white}....\color {black}C_{1}\;\;\;\;C\#\;\;\;\,D\;\;\;D\#\;\;\,E\;\;\;\;\,F\;\;\;\,F\#\;\;\;G\;\;\;\;G\#\;\;\;A\;\;\;\,A\#\;\;\;\,B\;\;\;C_{2}}$	2^(1/12)	A	OEIS: A010774	[1;16,1,4,2,7,1,1,2,2,7,4,1,2,1,60,1,3,1,2,...]		1.05946309435929526456182529494634170
1.01494 16064 09653 62502 ^{[Mw 93]}	Gieseking constant ^[113]		${\pi \ln \beta }$	${\frac {3{\sqrt {3}}}{4}}\left(1-\sum _{n=0}^{\infty }{\frac {1}{(3n+2)^{2}}}+\sum _{n=1}^{\infty }{\frac {1}{(3n+1)^{2}}}\right)=$ $\textstyle {\frac {3{\sqrt {3}}}{4}}\left(1-{\frac {1}{2^{2}}}+{\frac {1}{4^{2}}}-{\frac {1}{5^{2}}}+{\frac {1}{7^{2}}}-{\frac {1}{8^{2}}}+{\frac {1}{10^{2}}}\pm \cdots \right)$ .	sqrt(3)3/4 (1 -Sum[n=0 to ∞] {1/((3n+2)^2)} +Sum[n=1 to ∞] {1/((3n+1)^2)})		OEIS: A143298	[1;66,1,12,1,2,1,4,2,1,3,3,1,4,1,56,2,2,11,...]	1912	1.01494160640965362502120255427452028
2.62205 75542 92119 81046 ^{[Mw 94]}	Lemniscate constant ^[114]		${\varpi }$	$\pi \,{G}=4{\sqrt {\tfrac {2}{\pi }}}\,\Gamma {\left({\tfrac {5}{4}}\right)^{2}}={\tfrac {1}{4}}{\sqrt {\tfrac {2}{\pi }}}\,\Gamma {\left({\tfrac {1}{4}}\right)^{2}}=4{\sqrt {\tfrac {2}{\pi }}}\left({\tfrac {1}{4}}!\right)^{2}$	4 sqrt(2/pi) ((1/4)!)^2	T	OEIS: A062539	[2;1,1,1,1,1,4,1,2,5,1,1,1,14,9,2,6,2,9,4,1,...]	1798	2.62205755429211981046483958989111941
1.28242 71291 00622 63687 ^{[Mw 95]}	Glaisher–Kinkelin constant ^[115]		${A}$	$e^{{\frac {1}{12}}-\zeta ^{\prime }(-1)}=e^{{\frac {1}{8}}-{\frac {1}{2}}\sum \limits _{n=0}^{\infty }{\frac {1}{n+1}}\sum \limits _{k=0}^{n}\left(-1\right)^{k}{\binom {n}{k}}\left(k+1\right)^{2}\ln(k+1)}$	e^(1/12-zeta´{-1})	T ?	OEIS: A074962	[1;3,1,1,5,1,1,1,3,12,4,1,271,1,1,2,7,1,35,...]		1.28242712910062263687534256886979172
-4.22745 35333 76265 408 ^{[Mw 96]}	Digamma (1/4) ^[116]		${\psi }({\tfrac {1}{4}})$	$-\gamma -{\frac {\pi }{2}}-3\ln {2}=-\gamma +\sum _{n=0}^{\infty }\left({\frac {1}{n+1}}-{\frac {1}{n+{\tfrac {1}{4}}}}\right)$	-EulerGamma -\pi/2 -3 log 2		OEIS: A020777	-[4;4,2,1,1,10,1,5,9,11,1,22,1,1,14,1,2,1,4,...]		-4.2274535333762654080895301460966835
0.28674 74284 34478 73410 ^{[Mw 97]}	Strongly Carefree constant ^[117]		$K_{2}$	$\prod _{n=1}^{\infty }{\underset {p_{n}:{\text{ prime}}}{\left(1-{\frac {3p_{n}-2}{{p_{n}}^{3}}}\right)}}={\frac {6}{\pi ^{2}}}\prod _{n=1}^{\infty }{\underset {p_{n}:{\text{ prime}}}{\left(1-{\frac {1}{p_{n}(p_{n}+1)}}\right)}}$	N[ prod[k=1 to ∞] {1-(3*prime(k)-2) /(prime(k)^3)}]		OEIS: A065473	[0;3,2,19,3,12,1,5,1,5,1,5,2,1,1,1,1,1,3,7,...]		0.28674742843447873410789271278983845
1.78107 24179 90197 98523 ^{[Mw 98]}	Exp.gamma, Barnes G-function ^[118]		$e^{\gamma }$	$\prod _{n=1}^{\infty }{\frac {e^{\frac {1}{n}}}{1+{\tfrac {1}{n}}}}=\prod _{n=0}^{\infty }\left(\prod _{k=0}^{n}(k+1)^{(-1)^{k+1}{n \choose k}}\right)^{\frac {1}{n+1}}=$ $\textstyle \left({\frac {2}{1}}\right)^{1/2}\left({\frac {2^{2}}{1\cdot 3}}\right)^{1/3}\left({\frac {2^{3}\cdot 4}{1\cdot 3^{3}}}\right)^{1/4}\left({\frac {2^{4}\cdot 4^{4}}{1\cdot 3^{6}\cdot 5}}\right)^{1/5}\cdots$	Prod[n=1 to ∞] {e^(1/n)} /{1 + 1/n}		OEIS: A073004	[1;1,3,1,1,3,5,4,1,1,2,2,1,7,9,1,16,1,1,1,2,...]		1.78107241799019798523650410310717954
3.62560 99082 21908 31193 ^{[Mw 99]}	Gamma(1/4)^[119]		$\Gamma ({\tfrac {1}{4}})$	$4\left({\frac {1}{4}}\right)!=\left(-{\frac {3}{4}}\right)!$	4(1/4)!	T	OEIS: A068466	[3;1,1,1,2,25,4,9,1,1,8,4,1,6,1,1,19,1,1,4,1,...]	1729	3.62560990822190831193068515586767200
1.66168 79496 33594 12129 ^{[Mw 100]}	Somos' quadratic recurrence constant ^[120]		${\sigma }$	$\prod _{n=1}^{\infty }n^{{1/2}^{n}}={\sqrt {1{\sqrt {2{\sqrt {3\cdots }}}}}}=1^{1/2}\;2^{1/4}\;3^{1/8}\cdots$	prod[n=1 to ∞] {n ^(1/2)^n}	T ?	OEIS: A065481	[1;1,1,1,21,1,1,1,6,4,2,1,1,2,1,3,1,13,13,...]		1.66168794963359412129581892274995074
0.95531 66181 245092 78163	Magic angle ^[121]		${\theta _{m}}$	$\arctan \left({\sqrt {2}}\right)=\arccos \left({\sqrt {\tfrac {1}{3}}}\right)\approx \textstyle {54.7356}^{\circ }$	arctan(sqrt(2))	I	OEIS: A195696	[0;1,21,2,1,1,1,2,1,2,2,4,1,2,9,1,2,1,1,1,3,...]		0.95531661812450927816385710251575775
0.74759 79202 53411 43517 ^{[Mw 101]}	Rényi's Parking Constant ^[122]		${m}$	$\int \limits _{0}^{\infty }exp\left(\!-2\int \limits _{0}^{x}{\frac {1-e^{-y}}{y}}dy\right)\!dx={e^{-2\gamma }}\int \limits _{0}^{\infty }{\frac {e^{-2\Gamma (0,n)}}{n^{2}}}$	[e^(-2Gamma)] Int{n,0,∞}[ e^(- 2 *Gamma(0,n)) /n^2]		OEIS: A050996	[0;1,2,1,25,3,1,2,1,1,12,1,2,1,1,3,1,2,1,43,...]		0.74759792025341143517873094383017817
1.44466 78610 09766 13365 ^{[Mw 102]}	Steiner number, Iterated exponential Constant ^[123]		${\sqrt[{e}]{e}}$	$e^{\frac {1}{e}}{\color {White}{...........}}$ = Upper Limit of Tetration	e^(1/e)	T	OEIS: A073229	[1;2,4,55,27,1,1,16,9,3,2,8,3,2,1,1,4,1,9,...]		1.44466786100976613365833910859643022
0.69220 06275 55346 35386 ^{[Mw 103]}	Minimum value of función ƒ(x) = x^x ^[124]		${\left({\frac {1}{e}}\right)}^{\frac {1}{e}}$	${e}^{-{\frac {1}{e}}}{\color {White}{..........}}$ = Inverse Steiner Number	e^(-1/e)		OEIS: A072364	[0;1,2,4,55,27,1,1,16,9,3,2,8,3,2,1,1,4,1,9,...]		0.69220062755534635386542199718278976
0.34053 73295 50999 14282 ^{[Mw 104]}	Pólya Random walk constant ^[125]		${p(3)}$	$1-\!\!\left({3 \over (2\pi )^{3}}\int \limits _{-\pi }^{\pi }\int \limits _{-\pi }^{\pi }\int \limits _{-\pi }^{\pi }{dx\,dy\,dz \over 3-\!\cos x-\!\cos y-\!\cos z}\right)^{\!-1}$ $=1-16{\sqrt {\tfrac {2}{3}}}\;\pi ^{3}\left(\Gamma ({\tfrac {1}{24}})\Gamma ({\tfrac {5}{24}})\Gamma ({\tfrac {7}{24}})\Gamma ({\tfrac {11}{24}})\right)^{-1}$	1-16Sqrt[2/3]Pi^3 /(Gamma[1/24] Gamma[5/24] Gamma[7/24] *Gamma[11/24])		OEIS: A086230	[0;2,1,14,1,3,8,1,5,2,7,1,12,1,5,59,1,1,1,3,...]		0.34053732955099914282627318443290289
0.54325 89653 42976 70695 ^{[Mw 105]}	Bloch–Landau constant ^[126]		${L}$	$={\frac {\Gamma ({\tfrac {1}{3}})\;\Gamma ({\tfrac {5}{6}})}{\Gamma ({\tfrac {1}{6}})}}={\frac {(-{\tfrac {2}{3}})!\;(-1+{\tfrac {5}{6}})!}{(-1+{\tfrac {1}{6}})!}}$	gamma(1/3) *gamma(5/6) /gamma(1/6)		OEIS: A081760	[0;1,1,5,3,1,1,2,1,1,6,3,1,8,11,2,1,1,27,4,...]	1929	0.54325896534297670695272829530061323
0.18785 96424 62067 12024 ^{[Mw 106]} ^{[Ow 4]}	MRB Constant, Marvin Ray Burns ^[127]^[128]^[129]		$C_{{}_{MRB}}$	$\sum _{n=1}^{\infty }(-1)^{n}(n^{1/n}-1)=-{\sqrt[{1}]{1}}+{\sqrt[{2}]{2}}-{\sqrt[{3}]{3}}+\cdots$	Sum[n=1 to ∞] {(-1)^n (n^(1/n)-1)}		OEIS: A037077	[0;5,3,10,1,1,4,1,1,1,1,9,1,1,12,2,17,2,2,1,...]	1999	0.18785964246206712024851793405427323
1.27323 95447 35162 68615	Ramanujan–Forsyth series^[130]		${\frac {4}{\pi }}$	$\displaystyle \sum \limits _{n=0}^{\infty }\textstyle \left({\frac {(2n-3)!!}{(2n)!!}}\right)^{2}={1\!+\!\left({\frac {1}{2}}\right)^{2}\!+\!\left({\frac {1}{2\cdot 4}}\right)^{2}\!+\!\left({\frac {1\cdot 3}{2\cdot 4\cdot 6}}\right)^{2}+\cdots }$	Sum[n=0 to ∞] {[(2n-3)!! /(2n)!!]^2}	I	OEIS: A088538	[1;3,1,1,1,15,2,72,1,9,1,17,1,2,1,5,1,1,10,...]		1.27323954473516268615107010698011489
1.46707 80794 33975 47289 ^{[Mw 107]}	Porter Constant^[131]		${C}$	${\frac {6\ln 2}{\pi ^{2}}}\left(3\ln 2+4\,\gamma -{\frac {24}{\pi ^{2}}}\,\zeta '(2)-2\right)-{\frac {1}{2}}$ $\scriptstyle \gamma \,{\text{= Euler–Mascheroni Constant}}=0.5772156649\ldots$ $\scriptstyle \zeta '(2)\,{\text{= Derivative of }}\zeta (2)=-\sum \limits _{n=2}^{\infty }{\frac {\ln n}{n^{2}}}=-0.9375482543\ldots$	6ln2/pi^2(3ln2+ 4 EulerGamma- WeierstrassZeta'(2) *24/pi^2-2)-1/2		OEIS: A086237	[1;2,7,10,1,2,38,5,4,1,4,12,5,1,5,1,2,3,1,...]	1974	1.46707807943397547289779848470722995
4.66920 16091 02990 67185 ^{[Mw 108]}	Feigenbaum constant δ ^[132]		${\delta }$	$\lim _{n\to \infty }{\frac {x_{n+1}-x_{n}}{x_{n+2}-x_{n+1}}}\qquad \scriptstyle x\in (3.8284;\,3.8495)$ $\scriptstyle x_{n+1}=\,ax_{n}(1-x_{n})\quad {\text{or}}\quad x_{n+1}=\,a\sin(x_{n})$		T	OEIS: A006890	[4;1,2,43,2,163,2,3,1,1,2,5,1,2,3,80,2,5,...]	1975	4.66920160910299067185320382046620161
2.50290 78750 95892 82228 ^{[Mw 109]}	Feigenbaum constant α^[133]		$\alpha$	$\lim _{n\to \infty }{\frac {d_{n}}{d_{n+1}}}$		T ?	OEIS: A006891	[2;1,1,85,2,8,1,10,16,3,8,9,2,1,40,1,2,3,...]	1979	2.50290787509589282228390287321821578
0.62432 99885 43550 87099 ^{[Mw 110]}	Golomb–Dickman constant ^[134]		${\lambda }$	$\int \limits _{0}^{\infty }{\underset {{\text{Para }}x>2}{{\frac {f(x)}{x^{2}}}\,dx}}=\int \limits _{0}^{1}e^{\operatorname {Li} (n)}dn\quad \scriptstyle {\text{Li: Logarithmic integral}}$	N[Int{n,0,1}[e^Li(n)],34]		OEIS: A084945	[0;1,1,1,1,1,22,1,2,3,1,1,11,1,1,2,22,2,6,1,...]	1930 & 1964	0.62432998854355087099293638310083724
23.14069 26327 79269 0057 ^{[Mw 111]}	Gelfond constant ^[135]		${e}^{\pi }$	$(-1)^{-i}=i^{-2i}=\sum _{n=0}^{\infty }{\frac {\pi ^{n}}{n!}}={\frac {\pi ^{1}}{1}}+{\frac {\pi ^{2}}{2!}}+{\frac {\pi ^{3}}{3!}}+\cdots$	Sum[n=0 to ∞] {(pi^n)/n!}	T	OEIS: A039661	[23;7,9,3,1,1,591,2,9,1,2,34,1,16,1,30,1,...]		23.1406926327792690057290863679485474
7.38905 60989 30650 22723	Conic constant, Schwarzschild constant ^[136]		$e^{2}$	$\sum _{n=0}^{\infty }{\frac {2^{n}}{n!}}=1+2+{\frac {2^{2}}{2!}}+{\frac {2^{3}}{3!}}+{\frac {2^{4}}{4!}}+{\frac {2^{5}}{5!}}+\cdots$	Sum[n=0 to ∞] {2^n/n!}		OEIS: A072334	[7;2,1,1,3,18,5,1,1,6,30,8,1,1,9,42,11,1,...] = [7,2,1,1,n,4*n+6,n+2], n = 3, 6, 9, etc.		7.38905609893065022723042746057500781
0.35323 63718 54995 98454 ^{[Mw 112]}	Hafner–Sarnak–McCurley constant (1) ^[137]		${\sigma }$	$\prod _{k=1}^{\infty }\left\{1-[1-\prod _{j=1}^{n}{\underset {p_{k}:{\text{ prime}}}{(1-p_{k}^{-j})]^{2}}}\right\}$	prod[k=1 to ∞] {1-(1-prod[j=1 to n] {1-ithprime(k)^-j})^2}		OEIS: A085849	[0;2,1,4,1,10,1,8,1,4,1,2,1,2,1,2,6,1,1,1,3,...]	1993	0.35323637185499598454351655043268201
0.60792 71018 54026 62866 ^{[Mw 113]}	Hafner–Sarnak–McCurley constant (2) ^[138]		${\frac {1}{\zeta (2)}}$	${\frac {6}{\pi ^{2}}}=\prod _{n=0}^{\infty }{\underset {p_{n}:{\text{ prime}}}{\!\left(\!1-{\frac {1}{{p_{n}}^{2}}}\!\right)}}\!=\!\textstyle \left(1\!-\!{\frac {1}{2^{2}}}\right)\!\left(1\!-\!{\frac {1}{3^{2}}}\right)\!\left(1\!-\!{\frac {1}{5^{2}}}\right)\cdots$	Prod{n=1 to ∞} (1-1/ithprime(n)^2)	T	OEIS: A059956	[0;1,1,1,1,4,2,4,7,1,4,2,3,4,10,1,2,1,1,1,...]		0.60792710185402662866327677925836583
0.12345 67891 01112 13141 ^{[Mw 114]}	Champernowne constant ^[139]		$C_{10}$	$\sum _{n=1}^{\infty }\;\sum _{k=10^{n-1}}^{10^{n}-1}{\frac {k}{10^{kn-9\sum _{j=0}^{n-1}10^{j}(n-j-1)}}}$		T	OEIS: A033307	[0;8,9,1,149083,1,1,1,4,1,1,1,3,4,1,1,1,15,...]	1933	0.12345678910111213141516171819202123
0.76422 36535 89220 66299 ^{[Mw 115]}	Landau-Ramanujan constant ^[140]		$K$	${\frac {1}{\sqrt {2}}}\prod _{p\equiv 3\!\!\!\!\!\mod \!4}\!\!{\underset {\!\!\!\!\!\!\!\!p:{\text{ prime}}}{\left(1-{\frac {1}{p^{2}}}\right)^{-{\frac {1}{2}}}}}\!\!={\frac {\pi }{4}}\prod _{p\equiv 1\!\!\!\!\!\mod \!4}\!\!{\underset {\!\!\!\!p:{\text{ prime}}}{\left(1-{\frac {1}{p^{2}}}\right)^{\frac {1}{2}}}}$		T ?	OEIS: A064533	[0;1,3,4,6,1,15,1,2,2,3,1,23,3,1,1,3,1,1,6,4,...]		0.76422365358922066299069873125009232
1.92878 00... ^{[Mw 116]}	Wright constant ^[141]		${\omega }$	$\left\lfloor 2^{2^{2^{\cdot ^{\cdot ^{2^{\omega }}}}}}\!\right\rfloor \scriptstyle {\text{= primes:}}\displaystyle \left\lfloor 2^{\omega }\right\rfloor \scriptstyle {\text{=3,}}\displaystyle \left\lfloor 2^{2^{\omega }}\right\rfloor \scriptstyle {\text{=13,}}\displaystyle \left\lfloor 2^{2^{2^{\omega }}}\right\rfloor \scriptstyle =16381,\ldots$			OEIS: A086238	[1; 1, 13, 24, 2, 1, 1, 3, 1, 1, 3]		1.9287800...
2.71828 18284 59045 23536 ^{[Mw 117]}	Number e, Euler's number ^[142]		${e}$	$\!\lim _{n\to \infty }\!\left(\!1\!+\!{\frac {1}{n}}\right)^{n}\!=\!\sum _{n=0}^{\infty }{\frac {1}{n!}}={\frac {1}{0!}}+{\frac {1}{1}}+{\frac {1}{2!}}+{\frac {1}{3!}}+\textstyle \cdots$	Sum[n=0 to ∞] {1/n!}	T	OEIS: A001113	[2;1,2,1,1,4,1,1,6,1,1,8,1,1,10,1,1,12,1,...] = [2;1,2p,1], p∈ℕ		2.71828182845904523536028747135266250
0.36787 94411 71442 32159 ^{[Mw 118]}	Inverse of Number e ^[143]		${\frac {1}{e}}$	$\sum _{n=0}^{\infty }{\frac {(-1)^{n}}{n!}}={\frac {1}{0!}}-{\frac {1}{1!}}+{\frac {1}{2!}}-{\frac {1}{3!}}+{\frac {1}{4!}}-{\frac {1}{5!}}+\cdots$	Sum[n=2 to ∞] {(-1)^n/n!}	T	OEIS: A068985	[0;2,1,1,2,1,1,4,1,1,6,1,1,8,1,1,10,1,1,12,...] = [0;2,1,1,2p,1], p∈ℕ	1618	0.36787944117144232159552377016146086
0.69034 71261 14964 31946	Upper iterated exponential ^[144]		${H}_{2n+1}$	$\lim _{n\to \infty }{H}_{2n+1}=\textstyle \left({\frac {1}{2}}\right)^{\left({\frac {1}{3}}\right)^{\left({\frac {1}{4}}\right)^{\cdot ^{\cdot ^{\left({\frac {1}{2n+1}}\right)}}}}}={2}^{-3^{-4^{\cdot ^{\cdot ^{-2n-1}}}}}$	2^-3^-4^-5^-6^ -7^-8^-9^-10^ -11^-12^-13 …		OEIS: A242760	[0;1,2,4,2,1,3,1,2,2,1,4,1,2,4,3,1,1,10,1,3,2,...]		0.69034712611496431946732843846418942
0.65836 55992 ...	Lower límit iterated exponential ^[145]		${H}_{2n}$	$\lim _{n\to \infty }{H}_{2n}=\textstyle \left({\frac {1}{2}}\right)^{\left({\frac {1}{3}}\right)^{\left({\frac {1}{4}}\right)^{\cdot ^{\cdot ^{\left({\frac {1}{2n}}\right)}}}}}={2}^{-3^{-4^{\cdot ^{\cdot ^{-2n}}}}}$	2^-3^-4^-5^-6^ -7^-8^-9^-10^ -11^-12 …			[0;1,1,1,12,1,2,1,1,4,3,1,1,2,1,2,1,51,2,2,1,...]		0.6583655992...
3.14159 26535 89793 23846 ^{[Mw 119]}	π number, Archimedes number ^[146]		$\pi$	$\lim _{n\to \infty }\,2^{n}\underbrace {\sqrt {2-{\sqrt {2+{\sqrt {2+\cdots +{\sqrt {2}}}}}}}} _{n}$	Sum[n=0 to ∞] {(-1)^n 4/(2n+1)}	T	OEIS: A000796	[3;7,15,1,292,1,1,1,2,1,3,1,14,2,1,1,2,2,2,...]		3.14159265358979323846264338327950288
0.46364 76090 00806 11621	Machin–Gregory series^[147]		$\arctan {\frac {1}{2}}$	${\underset {{\text{For }}x=1/2\qquad \qquad }{\sum _{n=0}^{\infty }{\frac {(\!-1\!)^{n}\,x^{2n+1}}{2n+1}}={\frac {1}{2}}{-}{\frac {1}{3\!\cdot \!2^{3}}}{+}{\frac {1}{5\!\cdot \!2^{5}}}{-}{\frac {1}{7\!\cdot \!2^{7}}}{+}\cdots }}$	Sum[n=0 to ∞] {(-1)^n (1/2)^(2n+1) /(2n+1)}	A	OEIS: A073000	[0;2,6,2,1,1,1,6,1,2,1,1,2,10,1,2,1,2,1,1,1,...]		0.46364760900080611621425623146121440
1.90216 05831 04 ^{[Mw 120]}	Brun₂ constant = Σ inverse of Twin primes ^[148]		${B}_{\,2}$	$\textstyle {\underset {p,\,p+2:{\text{ prime}}}{\sum ({\frac {1}{p}}+{\frac {1}{p+2}})}}=({\frac {1}{3}}\!+\!{\frac {1}{5}})+({\tfrac {1}{5}}\!+\!{\tfrac {1}{7}})+({\tfrac {1}{11}}\!+\!{\tfrac {1}{13}})+\cdots$			OEIS: A065421	[1; 1, 9, 4, 1, 1, 8, 3, 4, 4, 2, 2]		1.902160583104
0.87058 83799 75 ^{[Mw 121]}	Brun₄ constant = Σ inv.prime quadruplets ^[149]		${B}_{\,4}$	$\textstyle {\sum ({\frac {1}{p}}+{\frac {1}{p+2}}+{\frac {1}{p+4}}+{\frac {1}{p+6}})}\scriptstyle \quad {p,\;p+2,\;p+4,\;p+6:{\text{ prime}}}$ $\textstyle {\left({\tfrac {1}{5}}+{\tfrac {1}{7}}+{\tfrac {1}{11}}+{\tfrac {1}{13}}\right)}+\left({\tfrac {1}{11}}+{\tfrac {1}{13}}+{\tfrac {1}{17}}+{\tfrac {1}{19}}\right)+\dots$			OEIS: A213007	[0; 1, 6, 1, 2, 1, 2, 956, 3, 1, 1]		0.870588379975
0.63661 97723 67581 34307 ^{[Mw 122]} ^{[Ow 5]}	Buffon constant^[150]		${\frac {2}{\pi }}$	${\frac {\sqrt {2}}{2}}\cdot {\frac {\sqrt {2+{\sqrt {2}}}}{2}}\cdot {\frac {\sqrt {2+{\sqrt {2+{\sqrt {2}}}}}}{2}}\cdots$ Viète product	2/Pi	T	OEIS: A060294	[0;1,1,1,3,31,1,145,1,4,2,8,1,6,1,2,3,1,4,...]	1540 to 1603	0.63661977236758134307553505349005745
0.59634 73623 23194 07434 ^{[Mw 123]}	Euler–Gompertz constant ^[151]		${G}$	$\!\int \limits _{0}^{\infty }\!\!{\frac {e^{-n}}{1{+}n}}\,dn=\!\!\int \limits _{0}^{1}\!\!{\frac {1}{1{-}\ln n}}\,dn=\textstyle {\tfrac {1}{1+{\tfrac {1}{1+{\tfrac {1}{1+{\tfrac {2}{1+{\tfrac {2}{1+{\tfrac {3}{1+3{/\cdots }}}}}}}}}}}}}$	integral[0 to ∞] {(e^-n)/(1+n)}		OEIS: A073003	[0;1,1,2,10,1,1,4,2,2,13,2,4,1,32,4,8,1,1,1,...]		0.59634736232319407434107849936927937
i ··· ^{[Mw 124]}	Imaginary number ^[152]		${i}$	${\sqrt {-1}}={\frac {\ln(-1)}{\pi }}\qquad \qquad \mathrm {e} ^{i\,\pi }=-1$	sqrt(-1)	C			1501 to 1576	i
0.69777 46579 64007 98200 ^{[Mw 125]}	Continued fraction constant, Bessel function^[153]		${C}_{CF}$	${\frac {I_{1}(2)}{I_{0}(2)}}={\frac {\sum \limits _{n=0}^{\infty }{\frac {n}{n!n!}}}{\sum \limits _{n=0}^{\infty }{\frac {1}{n!n!}}}}=\textstyle {\tfrac {1}{1+{\tfrac {1}{2+{\tfrac {1}{3+{\tfrac {1}{4+{\tfrac {1}{5+{\tfrac {1}{6+1{/\cdots }}}}}}}}}}}}}$	(Sum [n=0 to ∞] {n/(n!n!)}) / (Sum [n=0 to ∞] {1/(n!n!)})		OEIS: A052119	[0;1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,...] = [0;p+1], p∈ℕ		0.69777465796400798200679059255175260
2.74723 82749 32304 33305	Ramanujan nested radical ^[154]		$R_{5}$	$\scriptstyle {\sqrt {5+{\sqrt {5+{\sqrt {5-{\sqrt {5+{\sqrt {5+{\sqrt {5+{\sqrt {5-\cdots }}}}}}}}}}}}}}\;=\textstyle {\frac {2+{\sqrt {5}}+{\sqrt {15-6{\sqrt {5}}}}}{2}}$	(2+sqrt(5) +sqrt(15 -6 sqrt(5)))/2	A		[2;1,2,1,21,1,7,2,1,1,2,1,2,1,17,4,4,1,1,4,2,...]		2.74723827493230433305746518613420282
0.56714 32904 09783 87299 ^{[Mw 126]}	Omega constant, Lambert W function ^[155]		${\Omega }$	$\sum _{n=1}^{\infty }{\frac {(-n)^{n-1}}{n!}}=\,\left({\frac {1}{e}}\right)^{\left({\frac {1}{e}}\right)^{\cdot ^{\cdot ^{\left({\frac {1}{e}}\right)}}}}=e^{-\Omega }=e^{-e^{-e^{\cdot ^{\cdot ^{-e}}}}}$	Sum[n=1 to ∞] {(-n)^(n-1)/n!}	T	OEIS: A030178	[0;1,1,3,4,2,10,4,1,1,1,1,2,7,306,1,5,1,2,1,...]		0.56714329040978387299996866221035555
0.96894 61462 59369 38048	Beta(3) ^[156]		${\beta }(3)$	${\frac {\pi ^{3}}{32}}=\sum _{n=1}^{\infty }{\frac {-1^{n+1}}{(-1+2n)^{3}}}={\frac {1}{1^{3}}}{-}{\frac {1}{3^{3}}}{+}{\frac {1}{5^{3}}}{-}{\frac {1}{7^{3}}}{+}\cdots$	Sum[n=1 to ∞] {(-1)^(n+1) /(-1+2n)^3}	T	OEIS: A153071	[0;1,31,4,1,18,21,1,1,2,1,2,1,3,6,3,28,1,...]		0.96894614625936938048363484584691860
2.23606 79774 99789 69640	Square root of 5, Gauss sum ^[157]		${\sqrt {5}}$	$\scriptstyle (n=5)\displaystyle \sum _{k=0}^{n-1}e^{\frac {2k^{2}\pi i}{n}}=1+e^{\frac {2\pi i}{5}}+e^{\frac {8\pi i}{5}}+e^{\frac {18\pi i}{5}}+e^{\frac {32\pi i}{5}}$	Sum[k=0 to 4] {e^(2k^2 pi i/5)}	A	OEIS: A002163	[2;4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,...] = [2;4,...]		2.23606797749978969640917366873127624
3.35988 56662 43177 55317 ^{[Mw 127]}	Prévost constant Reciprocal Fibonacci constant^[158]		$\Psi$	$\sum _{n=1}^{\infty }{\frac {1}{F_{n}}}={\frac {1}{1}}+{\frac {1}{1}}+{\frac {1}{2}}+{\frac {1}{3}}+{\frac {1}{5}}+{\frac {1}{8}}+{\frac {1}{13}}+\cdots$ F_n: Fibonacci series	Sum[n=1 to ∞] {1/Fibonacci[n]}	I	OEIS: A079586	[3;2,1,3,1,1,13,2,3,3,2,1,1,6,3,2,4,362,...]	?	3.35988566624317755317201130291892717
2.68545 20010 65306 44530 ^{[Mw 128]}	Khinchin's constant ^[159]		$K_{\,0}$	$\prod _{n=1}^{\infty }\left[{1+{1 \over n(n+2)}}\right]^{\ln n/\ln 2}$	Prod[n=1 to ∞] {(1+1/(n(n+2))) ^(ln(n)/ln(2))}	T	OEIS: A002210	[2;1,2,5,1,1,2,1,1,3,10,2,1,3,2,24,1,3,2,...]	1934	2.68545200106530644530971483548179569

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Cite error: There are <ref group=Mw> tags on this page, but the references will not show without a {{reflist|group=Mw}} template (see the help page).
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[1] Steven Finch (2004). Harvard.edu (ed.). Unitarism and Infinitarism (PDF). p. 1.

[3] Mireille Bousquet-Mélou. CNRS, LaBRI, Bordeaux, France (ed.). Two-dimensional self-avoiding walks (PDF).{{cite book}}: CS1 maint: multiple names: editors list (link)

[4] Hugo Duminil-Copin and Stanislav Smirnov (2011). Universite de Geneve. (ed.). The connective constant of the honeycomb lattice √ (2 + √ 2) (PDF).

[6] W.A. Coppel (2000). Springer (ed.). Number Theory: An Introduction to Mathematics. p. 480. ISBN 978-0-387-89485-0.

[8] James Stuart Tanton (2005). Encyclopedia of Mathematics. p. 529. ISBN 9781438110080.

[10] Robert Baillie (2013). arxiv (ed.). Summing The Curious Series of Kempner and Irwin (PDF). p. 9.

[11] Leonhard Euler (1749). Consideratio quarumdam serierum, quae singularibus proprietatibus sunt praeditae. p. 108.

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