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 A226664 #8 Jun 19 2013 13:50:06 %S A226664 1,5,13,233,355,431,499,1319,1631,6005,6487,14303,45853,71515,186793 %N A226664 Integer k associated with the record-breaking number A226663(n) of primitive Collatz-like 3x+k cycles. %Y A226664 Cf. A226680. %K A226664 nonn %O A226664 1,2 %A A226664 _Geoffrey H. Morley_, Jun 15 2013