OFFSET
0,1
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 5.22 Lenz-Ising Constants, p. 399.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Wikipedia, Ising Model
FORMULA
g = 1 + Pi/4 + log((sqrt(2)/4)*log(1 + sqrt(2))).
EXAMPLE
0.619403698458631885718514208104164609712358495509146535066838397776...
MATHEMATICA
g = 1 + Pi/4 + Log[(Sqrt[2]/4)*Log[1 + Sqrt[2]]]; RealDigits[g, 10, 102] // First
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Jul 30 2014
STATUS
approved