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 A204891 #6 Feb 27 2013 09:44:08 %S A204891 1,3,2,5,4,9,17,8,7,12,11,18,38,17,16,23,22,31,68,30,29,40,109,39,107, %T A204891 38,37,47,46,59,156,58,174,57,56,69,213,68,67,80,79,94,255,93,92,109, %U A204891 278,108,302,107 %N A204891 Least k such that n divides A204890(k), the k-th difference of two primes. %C A204891 For a guide to related sequences, see A204892. %t A204891 (See the program at A204892.) %Y A204891 Cf. A204892. %K A204891 nonn %O A204891 1,2 %A A204891 _Clark Kimberling_, Jan 20 2012