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 A114529 #10 Feb 16 2025 08:32:59
%S A114529 41,929,1301,30240,32760,260609,1441440,1860768,2178540,3205440,
%T A114529 3378240,3423420,3914820,4029480,4437720,5738040,6093360,6807240,
%U A114529 7136640,7239120,7551360,9402120,10204740,12270720,12405120,12942720,13495680,14627340,14725620
%N A114529 Let S(n)=sigma(|n|)/2-n; sequence gives numbers n such that S(S(S(S(n))))=n. May be called {1,2}-sociable number of orders 1 or 2 or 4.
%H A114529 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SociableNumbers.html">Sociable Numbers</a>
%Y A114529 Cf. A113285, A114528.
%K A114529 nonn
%O A114529 1,1
%A A114529 _Yasutoshi Kohmoto_, Feb 15 2006
%E A114529 a(7)-a(29) from _Charles R Greathouse IV_, Nov 12 2010.