OFFSET
2,1
COMMENTS
Equals integral_{0..infinity} 2*Pi*x^3/(e^x-1) dx.
LINKS
David Broadhurst, Feynman’s sunshine numbers, arXiv:1004.4238 [physics.pop-ph] p. 6.
Wikipedia, Stefan-Boltzmann constant
EXAMPLE
40.802624638...
MATHEMATICA
RealDigits[2*Pi^5/15, 10, 100] // First
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Feb 26 2013
STATUS
approved