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A289758 Primes of the form k!5-1, where k!5 is the quintuple factorial number (A085157).

%I A289758 #6 Jul 12 2017 10:16:18
%S A289758 2,3,5,13,23,167,311,503,1696463,3616703,119351231,393749999,
%T A289758 388856692223,35437499999999,728640635326636031,3885182313590882303,
%U A289758 19837740893195045044223,5126863427472785697108393983,140901732869280543971697196500573487103
%N A289758 Primes of the form k!5-1, where k!5 is the quintuple factorial number (A085157).
%H A289758 Robert Price, <a href="/A289758/b289758.txt">Table of n, a(n) for n = 1..27</a>
%H A289758 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n5-1&amp;action=Search">PRP Records.Search for n!5-1.</a>
%H A289758 Joe McLean, <a href="http://web.archive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim2.htm">Interesting Sources of Probable Primes</a>
%H A289758 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A289758 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A289758 Select[Table[MultiFactorial[i, 5] - 1, {i, 2, 100}], PrimeQ[#]&]
%Y A289758 Cf. A085149.
%K A289758 nonn
%O A289758 1,1
%A A289758 _Robert Price_, Jul 11 2017