A290119 Primes of the form k!/6 - 1.

3, 19, 839, 6719, 6652799, 14529715199, 3487131647999, 59281238015999, 1067062284287999, 405483668029439999, 10069210510562305939559188678085666251210751999999999, 5069015533618896340602101361010794807396273594826751999999999999

Offset: 1

Author

Robert Price, Jul 19 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..14
• Joe McLean, Interesting Sources of Probable Primes.
• OpenPFGW Project, Primality Tester.

Crossrefs

Cf. A139176, A139201.

Programs

Mathematica

Select[Table[k! / 6 - 1, {k, 4, 100}], PrimeQ[#]&]

Formula

a(n) = A139176(A139201(n)). - Elmo R. Oliveira, Apr 15 2025

Extensions

3, 19 inserted by Georg Fischer, Dec 05 2024