A134877 - OEIS

%I #11 Jan 15 2021 09:15:06

%S 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,

%T 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,

%U 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

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

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

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

%Y Cf. A073009, A100085.

%K nonn,cons

%O 1,2

%A _Artur Jasinski_, Nov 14 2007