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 A226689 #4 Jun 20 2013 14:18:20 %S A226689 7,11,12,22,44,53,54,106,108,112,113,144,159,180 %N A226689 Conjectured record-breaking numbers of odd elements, for ascending positive integers k, in primitive cycles of positive integers under iteration by the Collatz-like 3x-k function. %C A226689 A cycle is called primitive if its elements are not a common multiple of the elements of another cycle. %C A226689 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. %C A226689 For primitive cycles, GCD(k,6)=1. %C A226689 For n<15, but probably not for all n, k = A226687(n) and the smallest integer in the T_k cycle associated with a(n) is A226688(n). %Y A226689 Cf. A226626, A226673. %K A226689 nonn %O A226689 1,1 %A A226689 _Geoffrey H. Morley_, Jun 19 2013