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 A048263 #7 Mar 30 2012 18:34:53 %S A048263 1,2,3,4,6,7,8,9,10,11,12,14,15,16,19,20,21,23,24,25,26,27,28,31,32, %T A048263 33,36,38,39,40,43,44,45,48,49,52,56,57,60,62,65,68,69,77,80,81,85,93, %U A048263 121 %N A048263 Numbers that aren't the sum of distinct primes of the form 4n+1. %D A048263 The Penguin Dictionary of Curious and Interesting Numbers, David Wells, entry 121. %Y A048263 Cf. A048262. %K A048263 fini,full,nonn %O A048263 1,2 %A A048263 _Jud McCranie_