A289729 Primes of the form k!6-9, where k!6 is the sextuple factorial number (A085158).

7, 31, 631, 14071, 116471, 24663654391, 1282510028791, 17450008575991, 333247405883391991, 5444123475574783991

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..18

Henri & Renaud Lifchitz, PRP Records.Search for n!6-9.

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 6] - 9, {i, 8, 100}], PrimeQ[#]&]
Select[Table[Times@@Range[n, 1, -6]-9, {n, 8, 100}], PrimeQ] (* Harvey P. Dale, Aug 21 2023 *)

Crossrefs

Cf. A289687.

Sequence in context: A139287 A139307 A197451 * A197301 A280038 A253640

Adjacent sequences: A289726 A289727 A289728 * A289730 A289731 A289732

Keyword

nonn

Author

Robert Price, Jul 10 2017

Status

approved