A134877 Decimal expansion of Sum_{k>=1} 1/(k!!)^(k!!).

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

Offset: 1

Author

Artur Jasinski, Nov 14 2007

Keywords

• nonn
• cons

Examples

			Sum_{k>=1} 1/(k!!)^(k!!) = 1.28703709664168181471132029755820425904216955340222081026798765926909...
		

Crossrefs

Cf. A073009, A100085.

Programs

Mathematica

RealDigits[N[Sum[1/n^n, {n, 1, 100}], 200]][[1]]