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 A101088 #2 Mar 30 2012 17:28:36 %S A101088 3,5,7,3,17,11,23,89,271,457,967,4049,181,8641,7193,2603047,68476319, %T A101088 335257649,5554901257,31797598073,23369856751,77031318395801969, %U A101088 3293187233103900007,637758902554659731714245315207 %N A101088 Prime subsequence of A077020 (also A001607). %H A101088 G. P. Michon, <a href="http://www.numericana.com/answer/numbers.htm#m">Never Back to -1</a>. %e A101088 a(13)=181 because A077020(26)=181 is the 13th prime value found in that sequence; A001607(26)=-181. %K A101088 nonn %O A101088 1,1 %A A101088 _Gerard P. Michon_, Dec 01 2004