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 A288718 #5 Jun 13 2017 23:02:22
%S A288718 2,3,5,7,37,67,313,751,2857,129169,576577,17873857,54286849,393750001,
%T A288718 643458817,19053977918977,206180145819649,
%U A288718 11716249122484566383298871297,177636555893291390456871518209,49055724379818682505120501943238657
%N A288718 Primes of the form k!5+1, where k!5 is the quintuple factorial number (A085157).
%H A288718 Robert Price, <a href="/A288718/b288718.txt">Table of n, a(n) for n = 1..28</a>
%H A288718 Henri& Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n5+1&action=Search">PRP Records.Search for n!5+1.</a>
%H A288718 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 A288718 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A288718 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A288718 Select[Table[MultiFactorial[i, 5] + 1, {i, 0, 100}], PrimeQ[#]&]
%Y A288718 Cf. A085148.
%K A288718 nonn
%O A288718 1,1
%A A288718 _Robert Price_, Jun 13 2017