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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..27

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, 2, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A085149.

Sequence in context: A282236 A215306 A072537 * A089477 A099962 A173718

Adjacent sequences:  A289755 A289756 A289757 * A289759 A289760 A289761

KEYWORD

nonn

AUTHOR

Robert Price, Jul 11 2017

STATUS

approved

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Last modified October 16 20:55 EDT 2019. Contains 328103 sequences. (Running on oeis4.)