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 A000173 #19 Feb 16 2025 08:32:20 %S A000173 30,1482,2418,24180,35238,263820,395730,473298,698130,763620,2212026, %T A000173 2233554,172459210,209524210,341354790,384121920,525150234,530946330, %U A000173 582129630,1799281330,2069510520,2514290520,3344596854,5251502340 %N A000173 Unitary-sociable numbers (smallest member of each cycle). %C A000173 If n=product p_i^a_i, d=product p_i^c_i is a unitary divisor of n if each c_i is 0 or a_i. %D A000173 R. K. Guy, Unsolved Problems in Number Theory, 3rd edition, Sect. B7. %H A000173 Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 01 2006, <a href="/A000173/b000173.txt">Table of n, a(n) for n = 1..44</a> %H A000173 David Moews, <a href="http://djm.cc/amicable.html">Perfect, amicable and sociable numbers</a>. %H A000173 J. O. M. Pedersen, <a href="http://amicable.homepage.dk/tables.htm">Tables of Aliquot Cycles</a>. [Broken link] %H A000173 J. O. M. Pedersen, <a href="http://web.archive.org/web/20140502102524/http://amicable.homepage.dk/tables.htm">Tables of Aliquot Cycles</a>. [Via Internet Archive Wayback-Machine] %H A000173 J. O. M. Pedersen, <a href="/A063990/a063990.pdf">Tables of Aliquot Cycles</a>. [Cached copy, pdf file only] %H A000173 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SociableNumbers.html">Sociable Numbers</a>. %Y A000173 Cf. A034444, A003416, A097323. %K A000173 nonn,nice %O A000173 1,1 %A A000173 _N. J. A. Sloane_ %E A000173 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 01 2006