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 A143645 #11 Oct 16 2023 11:27:32 %S A143645 24,36,55,17,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A143645 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A143645 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A143645 Aliquot sequence starting at 24. %F A143645 a(n+1) = A001065(a(n)). - _R. J. Mathar_, Oct 11 2017 %t A143645 NestList[If[#>0,DivisorSigma[1,#]-#,0]&,24,100] (* _Paolo Xausa_, Oct 16 2023 *) %Y A143645 Cf. A001065. %K A143645 nonn,easy %O A143645 0,1 %A A143645 _N. J. A. Sloane_, Nov 30 2008