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 A216856 #21 Sep 07 2014 08:32:31 %S A216856 12,10,7,29,54,29,48,47,25,28,8,32,9,7,44,43,16,21,79,75,54,54,39,51, %T A216856 52,62,30,27,83,104,93,79,79,73,120,61,102,220,870,135,4350 %N A216856 3-adic valuation of A216854(n). %C A216856 See the main entry A216854 for comments, motivation and links. %C A216856 Robert Gerbicz provided a further three terms that have not had their positioning established. By their relative positions, these are 13438, 26448 and 38015. - _James G. Merickel_, Oct 01 2012 %o A216856 (PARI) A216856(n) = valuation(A216854(n), 3) %K A216856 nonn,base,more %O A216856 1,1 %A A216856 _M. F. Hasler_, Sep 17 2012