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

Author

Sean A. Irvine, Aug 19 2021

Keywords

• nonn
• cons

Examples

			0.995322265018952734162069256367252928610...
		

Links

• Michael I. Shamos, Shamos's catalog of the real numbers (2011).

Crossrefs

Cf. A099286.

Programs

Mathematica

First[RealDigits[N[Erf[2],87]]] (* Stefano Spezia, Aug 20 2021 *)

PARI

1 - erfc(2) \\ Michel Marcus, Aug 20 2021

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)).