A289728 Primes of the form k!6-8, where k!6 is the sextuple factorial number (A085158).

19, 47, 83, 397, 1721, 229627, 21827567, 295540237, 13299311017, 678264862267, 3879320022245629336367, 817800727933873464057151867, 85869076433056713726000946867, 9531467484069295223586105103117, 15873007435437477980505511601565617

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..26

Henri & Renaud Lifchitz, PRP Records.Search for n!6-8.

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] - 8, {i, 8, 100}], PrimeQ[#]&]

Crossrefs

Cf. A289686.

Sequence in context: A048970 A068474 A201314 * A141973 A165672 A136686

Adjacent sequences: A289725 A289726 A289727 * A289729 A289730 A289731

Keyword

nonn

Author

Robert Price, Jul 10 2017

Status

approved