A347151 Decimal expansion of erf(2).

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

Links

Table of n, a(n) for n=0..86.

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

Cf. A099286.

Sequence in context: A343056 A117232 A155995 * A229191 A347166 A347081

Adjacent sequences: A347148 A347149 A347150 * A347152 A347153 A347154

Keyword

nonn,cons

Author

Sean A. Irvine, Aug 19 2021

Status

approved