OFFSET
0,1
COMMENTS
See Table 1, last row, first column, of the Bailey, Borwein and Crandall link. - Wolfdieter Lang, Apr 25 2014
LINKS
D.H. Bailey, J.M. Borwein, R.E. Crandall, Integrals of the Ising class
FORMULA
Limit_{n -> infinity} (2^n/n!)*integral_{0..infinity} p*BesselK(0,p)^n dp. - after Bailey & Borwein.
Equals 2*A080130^2.
EXAMPLE
0.6304735033743867961220401927108789...
MATHEMATICA
RealDigits[2*E^(-2*EulerGamma), 10, 100] // First
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Apr 25 2014
STATUS
approved