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 A226745 #8 Jun 17 2013 14:31:17 %S A226745 2,2,2,58,440,18248,1659002,71997050,6776406070,2038979576678 %N A226745 Least number k such that 9^(2^i) + k is prime for i = 0,1,..,n-1. %Y A226745 Cf. A129613, A225560, A226281, A226707. %K A226745 nonn,more %O A226745 1,1 %A A226745 _Robin Garcia_, Jun 16 2013 %E A226745 a(10) from _Giovanni Resta_, Jun 16 2013