login
A289758
Primes of the form k!5-1, where k!5 is the quintuple factorial number (A085157).
1
2, 3, 5, 13, 23, 167, 311, 503, 1696463, 3616703, 119351231, 393749999, 388856692223, 35437499999999, 728640635326636031, 3885182313590882303, 19837740893195045044223, 5126863427472785697108393983, 140901732869280543971697196500573487103
OFFSET
1,1
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 5] - 1, {i, 2, 100}], PrimeQ[#]&]
CROSSREFS
Cf. A085149.
Sequence in context: A215306 A072537 A357916 * A089477 A099962 A173718
KEYWORD
nonn
AUTHOR
Robert Price, Jul 11 2017
STATUS
approved