OFFSET
1,2
LINKS
Steven R. Finch, Errata and Addenda to Mathematical Constants, p. 35.
Nicholas Pippenger, Random cyclations, arXiv:math /0408031 [math.CO]
FORMULA
(sqrt(Pi)/2)*integral_{0..infinity} exp(-x - Ei(-x)/2), where Ei is the exponential integral function.
EXAMPLE
1.457270879273653853694454068120047059660530020235224659213297...
MATHEMATICA
digits = 102; (Sqrt[Pi]/2)*NIntegrate[Exp[-x - ExpIntegralEi[-x]/2], {x, 0, Infinity}, WorkingPrecision -> digits+10] // RealDigits[#, 10, digits]& // First
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Sep 08 2014
STATUS
approved