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 A217424 #11 Sep 07 2014 08:40:03 %S A217424 8,18,16,6,22,3,6,16,32,27,2,727 %N A217424 17-adic valuation of A217422. %C A217424 A217422 consists of numbers of the form (2^r)*(17^s). This sequence holds the s values. %Y A217424 Cf. A217422, A217423. %K A217424 nonn,base,less %O A217424 1,1 %A A217424 _James G. Merickel_, Oct 03 2012 %E A217424 a(12) added by _James G. Merickel_, Oct 07 2012