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 A226669 #8 Jun 20 2013 14:53:42 %S A226669 1,347,3811,177337,4513,17,174121,461,799,11,14212775,133,1531,47, %T A226669 56993425,587 %N A226669 Smallest integer in the primitive Collatz-like 3x+k cycle with the conjectured record-breaking maximal element A226667(n). %Y A226669 k = A226668(n). %Y A226669 Cf. A226685. %K A226669 nonn %O A226669 1,2 %A A226669 _Geoffrey H. Morley_, Jun 15 2013