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 A037160 #15 Mar 15 2023 15:06:36 %S A037160 21609,27889,54289,1461681,6610041,8037225,25250625,39778249,50908225, %T A037160 60637369,171321921,207504025,218123361,307265841,315808441,380367009, %U A037160 435598641,437353569,528126361,561073969,581340321,708890625,877285161 %N A037160 Squares in A037159. %t A037160 f[0] = 0; f[n_ /; 0 < n < 10^10] := 3*n - DivisorSigma[1, n]; f[_] = -1; Reap[For[k = 1, k < 3*10^4, k++, If[FixedPoint[f, k^2] == 0, Print[k^2]; Sow[k^2]]]][[2, 1]] (* _Jean-François Alcover_, Sep 17 2013 *) %Y A037160 Cf. A037159. %K A037160 nonn,nice %O A037160 1,1 %A A037160 _Naohiro Nomoto_ %E A037160 Better description from _Jud McCranie_, Dec 24 2000 %E A037160 More terms from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 09 2006