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A241532
Decimal expansion of 2*e^(-2*gamma), gamma being the Euler constant.
0
6, 3, 0, 4, 7, 3, 5, 0, 3, 3, 7, 4, 3, 8, 6, 7, 9, 6, 1, 2, 2, 0, 4, 0, 1, 9, 2, 7, 1, 0, 8, 7, 8, 9, 0, 4, 3, 5, 4, 5, 8, 7, 0, 7, 8, 7, 1, 2, 7, 3, 2, 3, 4, 1, 5, 7, 3, 8, 1, 7, 9, 8, 3, 7, 0, 8, 9, 7, 0, 0, 0, 3, 8, 2, 9, 9, 5, 8, 1, 9, 1, 1, 0, 1, 8, 9, 9, 5, 4, 1, 6, 5, 7, 8, 1, 7, 1, 9, 0, 9
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
Sequence in context: A184082 A198868 A249733 * A196830 A206530 A333549
KEYWORD
nonn,cons
AUTHOR
STATUS
approved