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 A226631 #7 Jun 15 2013 01:36:08
%S A226631 1,4,6,17,19,34,12,9,5,22,12,17,17,69,7,18,22,38,11,12,6,68,44,30,9,
%T A226631 19,68,14,22,44,23,30,84,8,17,17,30,12,68,18,7,22,15,22,85,10,14,22,
%U A226631 22,10,14,18,44,12,68,22,9,38,17,14,55,8,56,50,36,44,25,37
%N A226631 Length of the shortest primitive cycle(s) of positive integers under iteration by the 3x-k function, where k=A226630(n).
%C A226631 A cycle is called primitive if its elements are not a common multiple of the elements of another cycle.
%C A226631 The 3x-k function T_k is defined by T_k(x) = x/2 if x is even, (3x-k)/2 if x is odd.
%H A226631 Geoffrey H. Morley, <a href="/A226631/b226631.txt">Table of n, a(n) for n = 1..600</a>
%F A226631 a(n) = min_{j=A226628(n) to A226628(n+1)-1} A226625(j).
%K A226631 nonn
%O A226631 1,2
%A A226631 _Geoffrey H. Morley_, Jun 14 2013