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A347151
Decimal expansion of erf(2).
0
9, 9, 5, 3, 2, 2, 2, 6, 5, 0, 1, 8, 9, 5, 2, 7, 3, 4, 1, 6, 2, 0, 6, 9, 2, 5, 6, 3, 6, 7, 2, 5, 2, 9, 2, 8, 6, 1, 0, 8, 9, 1, 7, 9, 7, 0, 4, 0, 0, 6, 0, 0, 7, 6, 7, 3, 8, 3, 5, 2, 3, 2, 6, 2, 0, 0, 4, 3, 7, 2, 8, 0, 7, 1, 9, 9, 9, 5, 1, 7, 7, 3, 6, 7, 6, 2, 9
OFFSET
0,1
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
Cf. A099286.
Sequence in context: A343056 A117232 A155995 * A229191 A376642 A347166
KEYWORD
nonn,cons
AUTHOR
Sean A. Irvine, Aug 19 2021
STATUS
approved