OFFSET
1,2
COMMENTS
Arises in the weak-coupling BCS model of superconductors, from the integral Integral_{0..a} tanh(x)/x dx that approaches log(4*exp(gamma)*a/Pi) as a becomes large.
LINKS
J. Bardeen, L. N. Cooper, and J. R. Schrieffer, Theory of Superconductivity, Physical Review, 108 (1957), 1175-1204.
EXAMPLE
1.7638769888620456906926621345433395350860272289667507023134353211210579125900...
MATHEMATICA
RealDigits[Pi/E^(EulerGamma), 10, 100][[1]]
PROG
(PARI) Pi/exp(Euler) \\ Michel Marcus, Mar 28 2020
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Spenser Talkington, Mar 05 2020
STATUS
approved