OFFSET
0,1
LINKS
Michael I. Shamos, Shamos's catalog of the real numbers (2011).
FORMULA
Equals (2/sqrt(Pi)) * Integral_{x=0..2} exp(-x^2) dx.
Equals (2/sqrt(Pi)) * Sum_{k>=0} (-1)^k * 2^(2*k+1) / (k! * (2*k+1)).
EXAMPLE
0.995322265018952734162069256367252928610...
MATHEMATICA
First[RealDigits[N[Erf[2], 87]]] (* Stefano Spezia, Aug 20 2021 *)
PROG
(PARI) 1 - erfc(2) \\ Michel Marcus, Aug 20 2021
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Sean A. Irvine, Aug 19 2021
STATUS
approved