A222392 - OEIS

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A222392

Decimal expansion of sum(1/Gamma(n/2), n>=1).

5, 5, 7, 3, 1, 6, 9, 6, 6, 4, 3, 1, 0, 0, 3, 9, 7, 5, 3, 2, 5, 7, 9, 0, 4, 0, 4, 9, 7, 7, 5, 5, 8, 2, 4, 0, 0, 5, 3, 8, 3, 8, 5, 3, 1, 3, 5, 6, 4, 6, 6, 5, 3, 4, 3, 0, 3, 2, 4, 8, 1, 2, 0, 6, 4, 1, 8, 2, 9, 0, 3, 0, 7, 3, 2, 8, 3, 4, 5, 3, 5, 8, 4, 2, 2, 4, 5

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OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

FORMULA

Equals (1+erf(1))*e+1/sqrt(Pi), where erf is the error function (see A099286).

EXAMPLE

5.57316966431003975325790404977558240053838531356466534303248120641829030...

MATHEMATICA

RealDigits[(1 + Erf[1]) E + 1/Sqrt[Pi], 10, 90][[1]]

CROSSREFS