A290120 Primes of the form k!/7 - 1.

719, 51839, 347557429739519999, 3693145248412139519999, 786088879973155564264329346971464984708807393279999999999, 32977671048463054353156106097575368726182652081686848733183999999999999

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. A139177, A139202.

Programs

Mathematica

Select[Table[k! / 7 - 1, {k, 7, 100}], PrimeQ[#]&]

Formula

a(n) = A139177(A139202(n)). - Elmo R. Oliveira, Apr 16 2025