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 A114528 #14 Feb 16 2025 08:32:59
%S A114528 1248,1596,28272,30240,32760,463296,678032,1906128,2178540,4694328,
%T A114528 4697616,4698072,11110976,12865770,23569920,30998250,31235904,
%U A114528 37501072,45532800,63723600,76980288,95801088,142990848,146078592,163032720,614533696,1044244800,1379454720
%N A114528 Let S(n)=sigma(|n|)-3*n; sequence gives numbers n such that S(S(S(S(n))))=n. May be called {3,1}-Sociable number of orders 1 or 2 or 4.
%H A114528 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SociableNumbers.html">Sociable Numbers</a>
%o A114528 (PARI) S(n)=sigma(abs(n))-3*n
%o A114528 is(n)=S(S(S(S(n))))==n \\ _Charles R Greathouse IV_, Jan 16 2012
%Y A114528 Cf. A113285, A114529. Contains A069146 as a subsequence.
%K A114528 nonn
%O A114528 1,1
%A A114528 _Yasutoshi Kohmoto_, Feb 15 2006
%E A114528 a(5)-a(12) from _Charles R Greathouse IV_, Jan 20 2010
%E A114528 a(13)-a(28) from _Donovan Johnson_, Jan 16 2012