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 A161218 #6 Aug 18 2018 21:37:48 %S A161218 3,7,13,31,43,211,241,317,443,499,709,1097,1223,1459,1549,1663,1789 %N A161218 Primes in A161206. %Y A161218 Cf. A000040, A139253, A161206, A161414, A161423. %K A161218 more,nonn %O A161218 1,1 %A A161218 _Omar E. Pol_, Jun 10 2009 %E A161218 More terms from _Vincenzo Librandi_, Jan 30 2011