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 A279646 #32 Nov 29 2018 17:21:53 %S A279646 5,6,8,10,68,82,92,98,118,286,796,878,1360,1502,1516,1568,1646,3628, %T A279646 3716,4048,7982,12776,18070,20594,29902,39632,52988,53864,55610,67448, %U A279646 85402,89762 %N A279646 Numbers k such that k!6 - 3 is prime, where k!6 is the sextuple factorial number (A085158). %C A279646 Corresponding primes are: 2, 3, 13, 37, 73569236156415997, ... %C A279646 a(33) > 10^5. %C A279646 Terms > 10 correspond to probable primes. %H A279646 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n!6-3&action=Search">PRP Records. Search for n!6-3.</a> %H A279646 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 A279646 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a> %e A279646 10!6 - 3 = 10*4 - 3 = 37 is prime, so 10 is in the sequence. %t A279646 MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]]; %t A279646 Select[Range[4, 50000], PrimeQ[MultiFactorial[#, 6] - 3] &] %Y A279646 Cf. A007661, A037082, A084438, A123910, A242994. %K A279646 nonn,more %O A279646 1,1 %A A279646 _Robert Price_, Jul 07 2017 %E A279646 a(27)-a(32) from _Robert Price_, Aug 03 2018