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 A098188 #12 Feb 16 2025 08:32:54 %S A098188 263820,263940,280380,280500,395730,395910,420570,420750,172459210, %T A098188 218725430,272130250,218628662,209524210,246667790,231439570, %U A098188 230143790,384121920,384296640,408233280,408408000 %N A098188 Irregular triangle with 4 columns which contains in each row the members of a 4-cycle under the map x->A063919(x), iteration of summing the proper-unitary divisors. %C A098188 Initial values attracted by this sequence are in A098187. %C A098188 The iteration of this function also contains 2-cycles like 114->126->114... or 1140 -> 1260 ->1140,... or 3-cycles like 30->42->54->30->.... %H A098188 J. O. M. Pedersen, <a href="http://web.archive.org/web/20130731051700/http://amicable.homepage.dk/knwnu4.htm">Known Unitary Sociable Numbers of order four</a> [Via Internet Archive Wayback-Machine] %H A098188 J. O. M. Pedersen, <a href="/A319902/a319902.txt">Order 4 cycles</a>, 2007. %H A098188 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/UnitarySociableNumbers.html">Unitary Sociable Numbers</a> %e A098188 The first line represents the 4-cycle 280500->263820->263940->280380->280500->..., %e A098188 The second line represents the 4-cycle 420750->395730->395910->420570->420750->.. %Y A098188 Cf. A098185, A098186, A002827, A097024, A097030, A098187. %Y A098188 Cf. A319902 (where the terms are entered by increasing value). %K A098188 nonn,tabf,more %O A098188 1,1 %A A098188 _Labos Elemer_, Sep 02 2004 %E A098188 More terms from _Michel Marcus_, Oct 05 2018