A288718 Primes of the form k!5+1, where k!5 is the quintuple factorial number (A085157).

2, 3, 5, 7, 37, 67, 313, 751, 2857, 129169, 576577, 17873857, 54286849, 393750001, 643458817, 19053977918977, 206180145819649, 11716249122484566383298871297, 177636555893291390456871518209, 49055724379818682505120501943238657

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..28

Henri& Renaud Lifchitz, PRP Records.Search for n!5+1.

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, 5] + 1, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A085148.

Sequence in context: A090912 A048416 A048401 * A289861 A160748 A117639

Adjacent sequences: A288715 A288716 A288717 * A288719 A288720 A288721

Keyword

nonn

Author

Robert Price, Jun 13 2017

Status

approved