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 A083272 #17 Jun 23 2025 02:58:56
%S A083272 1,2,5,7,9,16,31,15,33,37,21,45,73,27,57,61,33,69,73,39,81,106,89,47,
%T A083272 49,76,157,55,113,59,61,63,193,67,69,141,145,149,77,157,81,206,169,
%U A083272 130,353,91,185,189,385,393,201,205,209,213,217,221,225,514,233,119,241,123,249
%N A083272 a(n) = n*tau(a(n-1)) + 1 = n*A000005(a(n-1)) + 1, a(0) = 1.
%H A083272 Harvey P. Dale, <a href="/A083272/b083272.txt">Table of n, a(n) for n = 0..1000</a>
%t A083272 h[x_] := x*DivisorSigma[0, h[x-1]]+1; h[0] = 1; Table[h[w], {w, 0, 100}]
%t A083272 nxt[{n_,a_}]:={n+1, (n+1)DivisorSigma[0,a]+1}; NestList[nxt,{0,1},70][[All,2]] (* _Harvey P. Dale_, Feb 06 2020 *)
%Y A083272 Cf. A000005, A083271.
%K A083272 easy,nonn
%O A083272 0,2
%A A083272 _Labos Elemer_, May 14 2003