Miguel Alejandro Moreno Barrientos

User: Miguel Alejandro Moreno Barrientos

Miguel Alejandro Moreno Barrientos's wiki page.

Miguel Alejandro Moreno Barrientos has authored 2 sequences.

A287013 Decimal expansion of Sum_{n>=0} 1/A000178(n).

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

Offset: 1

Miguel Alejandro Moreno Barrientos, May 18 2017

			2.58683453093647190149884744169194347173357090127887794475148...

Patrick C. Schneider, Table of n, a(n) for n = 1..10000

Cf. A000178, A137987.

NSum[1/BarnesG[n], {n, 2, Infinity}, WorkingPrecision -> 115] // RealDigits // First (* Jean-François Alcover, Oct 27 2020 *)

suminf(n=0, 1/prod(k=2, n, k!)) \\ Michel Marcus, Aug 01 2017

Equals 1/A137987. - Amiram Eldar, Nov 19 2020

More terms from Michel Marcus, Aug 01 2017

A281682 Decimal expansion of Sum_{n>=2} 1/A000166(n).

Original entry on oeis.org

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

Offset: 1

Miguel Alejandro Moreno Barrientos, Jan 26 2017

			1.63822707450537064754289311415112266106359324964443616472326282872630582...

Wikipedia, Subfactorial/Derangement definition

Cf. A000166.

PrecisionDigits ≔ 1000
NotationDigits ≔ 1000
sum(1/ROUND(n!/e), n, 2, 500)

a[n_]:=If[n>0, Round[n!/E], 1]; RealDigits[Sum[1/a[n], {n, 2, 500}], 10, 113][[1]](* Indranil Ghosh, Mar 12 2017 *)

Equals Sum_{n>=2} 1/round(n!/e).

cp's OEIS Frontend

User: Miguel Alejandro Moreno Barrientos

A287013 Decimal expansion of Sum_{n>=0} 1/A000178(n).

Views

Author

Keywords

Examples

Links

Crossrefs

Programs

Mathematica

PARI

Formula

Extensions