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 A120660 #8 Jan 23 2018 07:00:03 %S A120660 5,23,235915,231058199290237132541627094366157277 %N A120660 Trajectory of 5 under map "replace k with concatenation of anti-divisors of k". %C A120660 The next term is very large! %Y A120660 Cf. A066272, A130799, A120661. %K A120660 nonn,base %O A120660 1,1 %A A120660 _M. F. Hasler_, Jul 26 2007