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 A186298 #10 Jul 16 2013 03:05:41 %S A186298 1,9,17,41,57,65,81,105,129,137,161,177,209,225,249,281,305,329,345, %T A186298 377,417,441,465,489,497,521,545,561,569,585,617,641,657,681,689,737, %U A186298 785,809,825,857,881,905,945,969,1017,1049,1089,1121,1161,1169,1185 %N A186298 A007520(n)-2. %o A186298 (PARI) isok(n) = isprime(n+2) && (n % 8 == 1) \\ _Michel Marcus_, Jul 16 2013 %K A186298 nonn %O A186298 1,2 %A A186298 _Marco Matosic_, Feb 17 2011