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 A201001 #9 Jan 08 2013 09:10:44 %S A201001 3,109,141481,183642229,12435170468929559540592573684601 %N A201001 Primes in the Lucas U(3,-1) sequence. %C A201001 The Lucas U(3,-1) sequence is A006190. This sequence here contains U(3,-1,n) at n = 2, 5, 11, 17, 61, 103, 167,..., listed in A209493. %H A201001 Wikipedia, <a href="http://en.wikipedia.org/wiki/Lucas_sequence">Lucas sequence</a> %K A201001 nonn %O A201001 1,1 %A A201001 _R. J. Mathar_, Jan 08 2013