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 A090476 #4 Dec 05 2013 19:56:37 %S A090476 2,3,19,23,281,983,2621,3931,62903,212297,1698377,7925759,99071989, %T A090476 435916751,5448959389,17981565983,1390574436037,7072749286739, %U A090476 50923794864521,178233282025823,2851732512413171,30893768884476019 %N A090476 Beginning with 2, a(n+1) is the least prime == -1 (mod (Sum a(i), i=1 to n)). %Y A090476 Cf. A090474, A090475. %K A090476 nonn %O A090476 1,1 %A A090476 _Amarnath Murthy_, Dec 02 2003 %E A090476 More terms from _David Wasserman_, Nov 16 2005