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 A161191 #6 Sep 24 2013 05:42:35 %S A161191 281,857,1433,2459,1163,1381,7213,4729,2143,2591,13411,8783,2971,9311, %T A161191 9733,9931,11423,12037,4357,4703,4831,4933,27743,5903,6011,30259,6491, %U A161191 6827,20879,35059,7151,7759,8219,25321,8501,25849,8863,9067,9227,29641 %N A161191 Primes in A161190. %F A161191 A161190 INTERSECT A000040. %e A161191 a(1)=281 because 281 is prime and also the sum of the primes in the 4 diagonals: 11+31+37+43+47+53+59 = 281 %Y A161191 Cf. A161190 - A161194 %K A161191 easy,nonn,less %O A161191 1,1 %A A161191 _Enoch Haga_, Jun 06 2009