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 A324047 #5 Feb 14 2019 07:47:10 %S A324047 1,2,2,6,2,12,2,13,12,14,2,24,2,16,12,29,2,27,2,26,12,20,2,48,18,22, %T A324047 39,56,2,48,2,60,45,26,39,76,2,28,51,80,2,90,2,72,42,32,2,112,24,72, %U A324047 63,80,2,102,68,88,69,38,2,120,2,40,101,124,76,114,2,96,81,86,2,183,2,46,121,104,76,126,2,130,79,50,2,196,92,52 %N A324047 a(n) = A000203(n) - A106316(n). %H A324047 Antti Karttunen, <a href="/A324047/b324047.txt">Table of n, a(n) for n = 1..20000</a> %F A324047 a(n) = A000203(n) - A106316(n). %o A324047 (PARI) %o A324047 A106315(n) = (n*numdiv(n) % sigma(n)); %o A324047 A106316(n) = (A106315(n) % n); %o A324047 A324047(n) = (sigma(n) - A106316(n)); %Y A324047 Cf. A000005, A000203, A106315, A106316, A324045, A324046. %K A324047 nonn %O A324047 1,2 %A A324047 _Antti Karttunen_, Feb 13 2019