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 A217433 #9 Sep 07 2014 08:42:25 %S A217433 8,17,19,10,28 %N A217433 13-adic valuation of A217431. %C A217433 A217431 consists of numbers of the form (3^r)*(13^s). This sequence holds the s values. %Y A217433 Cf. A217431, A217432. %K A217433 nonn,base,more %O A217433 1,1 %A A217433 _James G. Merickel_, Oct 03 2012