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 A003079 #9 Oct 20 2023 22:37:42 %S A003079 5,14,7,20,10,5,14,7,20,10,5,14,7,20,10,5,14,7,20,10,5,14,7,20,10,5, %T A003079 14,7,20,10,5,14,7,20,10,5,14,7,20,10,5,14,7,20,10,5,14,7,20,10,5,14, %U A003079 7,20,10,5,14,7,20,10,5,14,7,20,10,5,14,7,20,10,5,14,7,20,10 %N A003079 One of the basic cycles in the x->3x-1 (x odd) or x/2 (x even) problem. %D A003079 R. K. Guy, Unsolved Problems in Number Theory, E16. %t A003079 NestList[If[OddQ[#],3#-1,#/2]&,5,80] (* _Harvey P. Dale_, Feb 27 2023 *) %K A003079 nonn,easy %O A003079 0,1 %A A003079 _N. J. A. Sloane_