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 A108491 #2 Mar 30 2012 17:36:43 %S A108491 2,31,421,5431,75431,764321,8764321,97654321,9765432101,198765432101 %N A108491 Smallest prime with a run of n strictly decreasing digits. %C A108491 This sequence contains A071360. a(10) = A104800(1). %Y A108491 Cf. A071360, A108471, A104800. %K A108491 base,fini,full,nonn %O A108491 1,1 %A A108491 _Rick L. Shepherd_, Jun 04 2005