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 A379769 #21 Jan 07 2025 10:07:09
%S A379769 0,1,2,0,0,2,2,4,5,7,7,11,11,13,0,2,1,4,3,6,7,8,7,12,12,13,14,17,16,
%T A379769 21,20,23,24,25,26,32,31,32,33,38,37,0,41,0,2,2,0,6,5,7,7,9,7,11,11,
%U A379769 15,15,15,13,21,19,19,21,24,24,28,26,28,28,32,30,38,36,36,38,40,40,44
%N A379769 a(n) = (A006218(n) mod n).
%F A379769 a(A050226(k)) = 0.
%e A379769 n = 7: a(7) = A006218(7) mod 7 = 2.
%t A379769 With[{nmax = 100}, Mod[Accumulate[DivisorSigma[0, Range[nmax]]], Range[nmax]]] (* _Amiram Eldar_, Jan 06 2025 *)
%o A379769 (PARI) a(n) = sum(k=1, n, numdiv(k)) % n; \\ _Michel Marcus_, Jan 06 2025
%Y A379769 Cf. A006218, A050226.
%K A379769 nonn,look
%O A379769 1,3
%A A379769 _Ctibor O. Zizka_, Jan 06 2025