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 A333784 #11 Apr 05 2020 18:50:12 %S A333784 0,0,0,0,0,3,0,0,0,5,0,9,0,7,5,0,0,12,0,15,7,11,0,21,0,13,0,21,0,33,0, %T A333784 0,11,17,7,36,0,19,13,35,0,45,0,33,20,23,0,45,0,30,17,39,0,39,11,49, %U A333784 19,29,0,89,0,31,28,0,13,69,0,51,23,61,0,84,0,37,30,57,11,81,0,75,0,41,0,121,17,43,29,77,0,117,13,69,31 %N A333784 a(n) = sigma(n) - A332994(n). %H A333784 Antti Karttunen, <a href="/A333784/b333784.txt">Table of n, a(n) for n = 1..16384</a> %H A333784 Antti Karttunen, <a href="/A333784/a333784.txt">Data supplement: n, a(n) computed for n = 1..65537</a> %H A333784 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a> %F A333784 a(n) = A000203(n) - A332994(n). %F A333784 a(n) = A001065(n) - A322382(n). %F A333784 a(n) = A333783(n) + A333791(n). %o A333784 (PARI) %o A333784 A332994(n) = if(1==n,n,n + A332994(n/vecmax(factor(n)[,1]))); %o A333784 A333784(n) = (sigma(n) - A332994(n)); %Y A333784 Cf. A000203, A000961 (positions of zeros), A001065, A052126, A322382, A332994, A333783, A333791. %K A333784 nonn %O A333784 1,6 %A A333784 _Antti Karttunen_, Apr 05 2020