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Decimal expansion of Sum_{n>=1} 1/A003422(n).
1

%I #16 Sep 30 2022 09:55:17

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

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

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

%N Decimal expansion of Sum_{n>=1} 1/A003422(n).

%e 1.887242872139005495...

%o (PARI) sumpos(m=1, 1/sum(k=0, m-1, k!)) \\ _Michel Marcus_, Sep 15 2022

%o (PARI) f=t=1.; 1+suminf(m=1, f*=m; t+=f; 1/t) \\ _Charles R Greathouse IV_, Sep 15 2022

%Y Cf. A001113, A003422.

%K nonn,cons

%O 1,2

%A _Hafiz A. Aziz_, Sep 15 2022

%E More digits from _Alois P. Heinz_, Sep 15 2022