A370013 Decimal expansion of Sum_{k>=0} 1/(k^2 + k)!.

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

Offset

1,2

Links

Table of n, a(n) for n=1..86.

Formula

(this constant) - (constant in A370012) = 1.0000000041753513975736197...

Example

1.50138889097656458808673054914...

Mathematica

s[x_] := s[x] = Sum[x^n/((n^2 + n)!), {n, 0, Infinity}]
First[RealDigits[N[s[1], 100]]]

Crossrefs

Cf. A370012.

Sequence in context: A117015 A325736 A370012 * A334364 A174859 A274619

Adjacent sequences: A370010 A370011 A370012 * A370014 A370015 A370016

Keyword

nonn,cons

Author

Clark Kimberling, Apr 04 2024

Status

approved