A248761 - OEIS

A248761

Decimal expansion of sum_{n >= 1} 1/sqrt(n!).

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

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

2.46950631452104756247563674466015025768975618399496919967792570...

MAPLE

evalf(sum(1/sqrt(n!), n=1..infinity), 120); # Vaclav Kotesovec, Oct 19 2014

MATHEMATICA

u = N[Sum[1/Sqrt[n!], {n, 1, 200}], 100]

RealDigits[u] (* A248761 *)