cp's OEIS Frontend

A289822 Primes of the form k!3-2187, where k!3 is the triple factorial number (A007661).

%I A289822 #9 Jul 15 2023 16:07:35
%S A289822 1453,10133,56053,1104373,24342133,96340213,2504900213,
%T A289822 3091650738173813,1668492340691778657530675197813,
%U A289822 116346745870073113470947277571643877742200278220799997813,10027451552263982384838074729160019340604318179653944179011587407871999999997813
%N A289822 Primes of the form k!3-2187, where k!3 is the triple factorial number (A007661).
%H A289822 Harvey P. Dale, <a href="/A289822/b289822.txt">Table of n, a(n) for n = 1..19</a>
%H A289822 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n3-2187&amp;action=Search">PRP Records.Search for n!3-2187.</a>
%H A289822 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 A289822 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A289822 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A289822 Select[Table[MultiFactorial[i, 3] - 2187, {i, 13, 100}], PrimeQ[#]&]
%t A289822 Select[Table[Times@@Range[n,1,-3]-2187,{n,13,200}],PrimeQ] (* _Harvey P. Dale_, Jul 15 2023 *)
%Y A289822 Cf. A267382.
%K A289822 nonn
%O A289822 1,1
%A A289822 _Robert Price_, Jul 12 2017