OFFSET
0,2
LINKS
R. W. Gosper, Some identities, (d162).
FORMULA
Equals (3^(1/4) * exp(-gamma/2) * Gamma(1/3)^3 / (4*Pi^2))^(Pi/sqrt(3)) / 3^(3*(log(3) + 2*gamma)/4), where gamma is the Euler-Mascheroni constant A001620 and Gamma() is the Gamma function.
EXAMPLE
0.0413062412559336395283825210006728108317741296744868855779544405463319...
MAPLE
evalf((3^(1/4) * exp(-gamma/2) * GAMMA(1/3)^3 / (4*Pi^2))^(Pi/sqrt(3)) / 3^(3*(log(3) + 2*gamma)/4), 120);
MATHEMATICA
Join[{0}, RealDigits[(3^(1/4) * Exp[-EulerGamma/2] * Gamma[1/3]^3/4/Pi^2)^ (Pi/Sqrt[3])/3^(3*(Log[3] + 2*EulerGamma)/4), 10, 120][[1]]]
PROG
(PARI) default(realprecision, 200); exp(sumpos(n=1, log(n - 2/3)/(n - 2/3) - log(n)/n))
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Vaclav Kotesovec, Jul 04 2022
STATUS
approved