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

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 *)

Prog

(PARI) suminf(n=1, (1/sqrt(n!))) \\ Michel Marcus, Oct 18 2014

Crossrefs

Cf. A214869, A248696, A248759, A248760.

Sequence in context: A335923 A335924 A369543 * A176461 A255249 A330394

Adjacent sequences: A248758 A248759 A248760 * A248762 A248763 A248764

Keyword

nonn,easy,cons

Author

Clark Kimberling, Oct 13 2014

Status

approved