A290123 Primes of the form k!/10 - 1.

11, 71, 503, 3991679, 622702079, 35568742809599, 30488834461171386050150399999, 579712602074736798587973423157810910541235724473162595874586504971639017969389205625618453424974594047999999999999999999

Offset: 1

Author

Robert Price, Jul 19 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..9
• Joe McLean, Interesting Sources of Probable Primes.
• OpenPFGW Project, Primality Tester.

Crossrefs

Cf. A139185, A139205, A290116, A290117, A290118, A290119, A290120, A290121, A290122.

Programs

Mathematica

Select[Table[k! / 10 - 1, {k, 5, 100}], PrimeQ[#]&]

Formula

a(n) = A139185(A139205(n)). - Elmo R. Oliveira, Apr 16 2025

Extensions

Missing terms inserted by Alois P. Heinz, Dec 05 2024