cp's OEIS Frontend

A289634 Primes of the form k!3-3, where k!3 is the triple factorial number (A007661).

%I A289634 #22 Nov 25 2022 11:32:34
%S A289634 7,277,877,3637,58237,24344317,17041023997,
%T A289634 44656330909544934316361777151999997,
%U A289634 3304568487306325139410771509247999997,17994728558292550488813850298696914425610239999997,2136063198892150618502015301628828867230815945271103455231999999997
%N A289634 Primes of the form k!3-3, where k!3 is the triple factorial number (A007661).
%H A289634 Robert Price, <a href="/A289634/b289634.txt">Table of n, a(n) for n = 1..17</a>
%H A289634 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n3-3&amp;action=Search">PRP Records.Search for n!3-3.</a>
%H A289634 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 A289634 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A289634 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A289634 Select[Table[MultiFactorial[i, 3] - 3, {i, 4, 100}], PrimeQ[#]&]
%t A289634 Select[Table[Times@@Range[n,1,-3]-3,{n,2,200}],PrimeQ] (* _Harvey P. Dale_, Nov 25 2022 *)
%Y A289634 Cf. A242994.
%K A289634 nonn
%O A289634 1,1
%A A289634 _Robert Price_, Jul 12 2017