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 A226674 #4 Jun 20 2013 14:29:09 %S A226674 1,5,17,23,29,85,125,143,253,313,439,509,563,1079,1135,1307,1699,3299, %T A226674 8431,10531,11491,16819,22097,24917,49787,67475,76733,99391,110273, %U A226674 111611,144379,273641,308219 %N A226674 Integer k associated with the conjectured record-breaking number A226673(n) of odd elements in a primitive Collatz-like 3x+k cycle. %Y A226674 Cf. A226675. %K A226674 nonn %O A226674 1,2 %A A226674 _Geoffrey H. Morley_, Jun 19 2013