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 A226766 #8 Jun 17 2013 15:36:22 %S A226766 1,1,1,1,15,93,53097,3014907,2295032545,46868723367 %N A226766 Least number k such that 4^(2^i) + k is prime for i = 0,1,..,n-1. %C A226766 a(7) = 53097 < A129613(7) (base-2 version). %Y A226766 Cf. A129613, A225560, A226281, A226707 %K A226766 nonn,more %O A226766 1,5 %A A226766 _Robin Garcia_, Jun 17 2013 %E A226766 a(10) from _Giovanni Resta_, Jun 17 2013