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 A259359 #5 Jul 08 2015 11:11:21 %S A259359 5,7,9,19,41,43,83,89,91,143,299,307,341,381,585,995,1019,1027,2043, %T A259359 4301,6275,11157,11621,12315,17505,24771,30535,38635 %N A259359 Numbers n such that n!!-8 is prime. %C A259359 Corresponding primes are 7, 97, 937, 654729067, 13113070457687988603440617, ... . %C A259359 a(29) > 50000. %H A259359 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> %t A259359 Select[Range[5,1000],PrimeQ[#!!-8]&] %Y A259359 Cf. A006882, A007749, A094144, A123910, A258616. %K A259359 hard,more,nonn %O A259359 1,1 %A A259359 _Robert Price_, Jun 24 2015