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 A289757 #6 Jul 12 2017 10:18:12
%S A289757 2,3,5,7,17,29,43,59,97,509,1559,12239,198719,379439,633599,
%T A289757 1136678399,33739804799,99298742399,1990648483199,
%U A289757 59126328543388935628799,3797826416991538753535999,2409161546475779555007420356689919999,9325555101161759039183007326207999999
%N A289757 Primes of the form k!7-1, where k!7 is the septuple factorial number (A114799).
%H A289757 Robert Price, <a href="/A289757/b289757.txt">Table of n, a(n) for n = 1..34</a>
%H A289757 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n7-1&action=Search">PRP Records.Search for n!7-1.</a>
%H A289757 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 A289757 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A289757 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A289757 Select[Table[MultiFactorial[i, 7] - 1, {i, 2, 100}], PrimeQ[#]&]
%Y A289757 Cf. A156167.
%K A289757 nonn
%O A289757 1,1
%A A289757 _Robert Price_, Jul 11 2017