A371501 Decimal expansion of Sum_{k>=0} 1 / (k^2 - k)!.

2, 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

1,1

Links

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

Index entries for transcendental numbers.

Formula

(this constant) - (constant in A371500) = 2.00277777777777777859984130244...

Equals 1+ A370013. - R. J. Mathar, Apr 14 2024

Example

2.501388890976564588086730549...

Mathematica

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

Prog

(PARI) suminf(k=0, 1/(k^2-k)!) \\ Charles R Greathouse IV, Nov 26 2024

Crossrefs

Cf. A371500.

Sequence in context: A004598 A091086 A336686 * A118349 A341268 A011183

Adjacent sequences: A371498 A371499 A371500 * A371502 A371503 A371504

Keyword

nonn,cons

Author

Clark Kimberling, Apr 04 2024

Status

approved