OFFSET
0,1
LINKS
Michael Ian Shamos, A catalog of the real numbers (2011), p. 397.
Eric Weisstein's World of Mathematics, Exponential Integral.
Wikipedia, Exponential Integral.
FORMULA
Equals Integral_{x=0..1} x/(1 - log(x)) dx.
Equals - e^2*Ei(-2), where Ei(x) is the Exponential Integral function [Shamos].
Equals Integral_{x=0..oo} dx/(e^x*(x + 2)) [Shamos].
EXAMPLE
0.361328616888222584697161657678739938954590641...
MATHEMATICA
RealDigits[-E^2 * ExpIntegralEi[-2], 10, 120][[1]] (* Amiram Eldar, Feb 04 2024 *)
PROG
(PARI) intnum(x=0, 1, x/(1-log(x)))
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Claude H. R. Dequatre, Feb 04 2024
STATUS
approved