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A099286 Decimal expansion of the error function at 1. 3
8, 4, 2, 7, 0, 0, 7, 9, 2, 9, 4, 9, 7, 1, 4, 8, 6, 9, 3, 4, 1, 2, 2, 0, 6, 3, 5, 0, 8, 2, 6, 0, 9, 2, 5, 9, 2, 9, 6, 0, 6, 6, 9, 9, 7, 9, 6, 6, 3, 0, 2, 9, 0, 8, 4, 5, 9, 9, 3, 7, 8, 9, 7, 8, 3, 4, 7, 1, 7, 2, 5, 4, 0, 9, 6, 0, 1, 0, 8, 4, 1, 2, 6, 1, 9, 8, 3, 3, 2, 5, 3, 4, 8, 1, 4, 4, 8, 8, 8, 4, 5, 4, 1, 5, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..104.

Eric Weisstein's World of Mathematics, Erf

FORMULA

Equals 1-A099287.

Equals (1/e) Sum_{n >= 0} (1/(n/2)!) - 1. - Jean-Fran├žois Alcover, Jun 14 2020

From Amiram Eldar, Jul 22 2020: (Start)

Equals (2/sqrt(Pi)) * Integral_{x=0..1} exp(-x^2) dx.

Equals (2/sqrt(Pi)) * Sum_{k>=0} (-1)^k/(k! * (2*k + 1)) = (2/sqrt(Pi)) * Sum_{k>=0} (-1)^k/A007680(k).

Equals (1/e) * Sum_{k>=1} 1/Gamma(k + 1/2). (End)

EXAMPLE

0.84270079294971486934122063508260925929606699796630290845993789783...

MATHEMATICA

RealDigits[ Erf[1], 10, 105][[1]]

PROG

(PARI) 1 - erfc(1)

CROSSREFS

Cf. A007680, A099287.

Sequence in context: A010523 A231534 A014391 * A089729 A173670 A337170

Adjacent sequences:  A099283 A099284 A099285 * A099287 A099288 A099289

KEYWORD

cons,nonn

AUTHOR

Robert G. Wilson v, Oct 08 2004

STATUS

approved

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Last modified May 11 09:11 EDT 2021. Contains 343788 sequences. (Running on oeis4.)