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 A169641 #8 Jun 11 2021 00:36:07 %S A169641 177,246,245,236,230,178,244,275,295,342,274,326,247,253,281,285,293, %T A169641 333,286,302 %N A169641 Start with n, apply the map k -> A169639(k) until trajectory converges; sequence give full list of the 20 possible limit points. %C A169641 There is a slight ambiguity in the definition, but I believe these are all the numbers which eventually return to themselves under iteration of k -> A169639(k). - _N. J. A. Sloane_, Jun 11 2021 %K A169641 nonn,word %O A169641 1,1 %A A169641 _Jacques ALARDET_, Apr 04 2010 %E A169641 Edited by _N. J. A. Sloane_, Apr 05 2010