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 A351746 #6 Feb 18 2022 07:54:47
%S A351746 0,1,2,2,4,6,6,3,4,10,10,10,12,14,12,4,16,11,18,16,16,22,22,14,8,26,6,
%T A351746 22,28,28,30,5,24,34,20,18,36,38,28,22,40,36,42,34,20,46,46,18,12,19,
%U A351746 36,40,52,16,28,30,40,58,58,44,60,62,26,6,32,52,66,52,48,44,70,25,72,74
%N A351746 a(n) = Sum_{p|n, p prime} (p-1) * tau(n/p).
%F A351746 a(n) = A351711(n) - A248577(n).
%e A351746 a(12) = 10; a(12) = Sum_{p|12, p prime} (p-1) * tau(12/p) = (2-1)*tau(12/2) + (3-1)*tau(12/3) = tau(6) + 2*tau(4) = 4 + 2*3 = 10.
%o A351746 (PARI) a(n) = my(f=factor(n)); sum(k=1, #f~, (f[k,1]-1)*numdiv(n/f[k,1])); \\ _Michel Marcus_, Feb 18 2022
%Y A351746 Cf. A000005 (tau), A001221 (omega), A248577, A351711.
%K A351746 nonn
%O A351746 1,3
%A A351746 _Wesley Ivan Hurt_, Feb 17 2022