OFFSET
0,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..5000
Victor Adamchik, A Class of Logarithmic Integrals (1997) Proc. of ISSAC'97
FORMULA
(Pi/2)*log(4*Pi^3/Gamma(1/4)^4).
Also equals 2*Integral_{0..1} (1/(x^2+1))*log(log(1/x)) dx.
Also equals 2*Integral_{Pi/4..Pi/2} log(log(tan(x))) dx.
EXAMPLE
-0.5208856126019768910801877375794544390636383554462853499753755842...
MATHEMATICA
RealDigits[(Pi/2)*Log[4*Pi^3/Gamma[1/4]^4], 10, 103] // First
PROG
(PARI) (Pi/2)*log(4*Pi^3/gamma(1/4)^4) \\ Michel Marcus, Apr 22 2015
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Apr 22 2015
STATUS
approved