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 A217429 #8 Sep 07 2014 08:20:50 %S A217429 55,112,79,28,107,105,84,50,92,1501 %N A217429 2-adic valuation of A217428. %C A217429 A217428 consists of numbers of the form (2^r)*(19^s). This sequence holds the r values. %Y A217429 Cf. A217428, A217430. %K A217429 nonn,base,less %O A217429 1,1 %A A217429 _James G. Merickel_, Oct 03 2012