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 A226687 #6 Jun 18 2013 12:34:38 %S A226687 1,19,23,25,113,467,697,3377,7153,34595,41807,62675,66781,271591 %N A226687 Integer k associated with the conjectured record-breaking length A226686(n) of primitive Collatz-like 3x-k cycles. %Y A226687 Cf. A226671, A226688. %K A226687 nonn %O A226687 1,2 %A A226687 _Geoffrey H. Morley_, Jun 16 2013