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 A226668 #8 Jun 20 2013 14:36:57 %S A226668 1,5,29,343,439,3437,3787,3949,13033,28493,30809,42887,178459,184861, %T A226668 215663,227063 %N A226668 Integer k associated with the conjectured record-breaking maximal element A226667(n) of primitive Collatz-like 3x+k cycles. %Y A226668 Cf. A226669, A226684. %K A226668 nonn %O A226668 1,2 %A A226668 _Geoffrey H. Morley_, Jun 15 2013