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 A226688 #6 Jun 18 2013 12:35:00 %S A226688 17,115,2263,113,769,436099,6073,3735185,194197,230891,4575823,823027, %T A226688 21111517,12477095 %N A226688 Smallest positive integer in the primitive Collatz-like 3x-k cycle(s) with the conjectured record-breaking length A226686(n). %Y A226688 k = A226687(n). %Y A226688 Cf. A226672. %K A226688 nonn %O A226688 1,1 %A A226688 _Geoffrey H. Morley_, Jun 16 2013