OFFSET
0,1
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 5.4.2 Random Mapping Statistics, p. 288.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..2500
Paul W. Purdom and John H. Williams, Cycle length in a random function, Transactions of the American Mathematical Society, Vol. 133, No. 2 (1968), pp. 547-551.
Eric Weisstein's MathWorld, Golomb-Dickman Constant.
Wikipedia, Golomb-Dickman constant.
FORMULA
Equals sqrt(Pi/2)*Integral_{x=0..1} exp(li(x)) dx, where li is the logarithmic integral function.
EXAMPLE
0.78248160099165661501621518806291...
MATHEMATICA
lambda = Integrate[Exp[LogIntegral[x]], {x, 0, 1}]; N[lambda*Sqrt[Pi/2], 99] // RealDigits // First
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Jun 19 2014
STATUS
approved