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 A162967 #11 Dec 26 2024 03:56:46
%S A162967 1,4,7,8,12,14,15,24,24,28,28,32,32,39,39,42,56,56,60,60,60,60,63,63,
%T A162967 72,80,84,90,91,96,96,96,96,104,112,114,120,120,120,120,124,124,124,
%U A162967 126,128,128,133,160,168,168,168,168,171,171,186,186,195,195,195,195,195
%N A162967 Values taken by the sigma(sigma(n)) function A051027, with repetition, sorted into ascending order.
%C A162967 Removal of duplicates generates A070286. - _R. J. Mathar_, Jul 21 2009
%H A162967 Amiram Eldar, <a href="/A162967/b162967.txt">Table of n, a(n) for n = 1..10000</a>
%H A162967 Max Alekseyev, <a href="https://oeis.org/wiki/User:Max_Alekseyev/gpscripts">PARI/GP Scripts for Miscellaneous Math Problems</a> (invphi.gp).
%o A162967 (PARI) f(k) = {my(v = invsigma(k), c = 0); for(i = 1, #v, c += invsigmaNum(v[i])); c;} \\ using _Max Alekseyev_'s invphi.gp
%o A162967 list(lim) = {my(m); for(k = 1, lim, m = f(k); for(i = 1, m, print1(k, ", ")));} \\ _Amiram Eldar_, Dec 26 2024
%Y A162967 Cf. A007609, A002191. - _R. J. Mathar_, Jul 21 2009
%Y A162967 Cf. A051027, A070286.
%K A162967 nonn
%O A162967 1,2
%A A162967 _Jaroslav Krizek_, Jul 19 2009