This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A288152 #6 Jun 05 2017 23:09:15 %S A288152 3,5,21,29,41,65,243,305,389,509,819,1653,7493,8613,8619,10257,11829, %T A288152 12977,15651,24341,29367,31629,40173 %N A288152 Numbers k such that k!6 + 8 is prime, where k!6 is the sextuple factorial number (A085158 ). %C A288152 Corresponding primes are: 11, 13, 8513, 623653, 894930583, 8549258359016383, ... %C A288152 a(24) > 50000. %C A288152 Terms > 41 correspond to probable primes. %H A288152 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n!6+8&action=Search">PRP Records. Search for n!6+8.</a> %H A288152 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 A288152 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a> %e A288152 21!6 + 8 = 21*15*9*3 + 8 = 8513 is prime, so 21 is in the sequence. %t A288152 MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]]; %t A288152 Select[Range[0, 50000], PrimeQ[MultiFactorial[#, 6] + 8] &] %Y A288152 Cf. A007661, A037082, A084438, A123910, A242994. %K A288152 nonn,more %O A288152 1,1 %A A288152 _Robert Price_, Jun 05 2017