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 A082909 #12 Jan 09 2022 17:10:21
%S A082909 1,3,1,4,3,3,2,6,1,6,3,4,2,6,3,7,3,3,2,9,2,6,3,6,4,6,1,8,3,6,2,9,3,6,
%T A082909 6,4,2,6,2,12,3,6,2,9,3,6,3,7,3,9,3,8,3,3,6,12,2,6,3,9,2,6,2,10,6,6,2,
%U A082909 9,3,12,3,6,2,6,4,8,6,6,2,15,1,6,3,8,6,6,3,12,3,6,4,9,2,6,6,9,2,9,3,13,3,6
%N A082909 a(n) = Sum_{d|n} (d mod 3).
%C A082909 The old entry with this sequence number was a duplicate of A070940.
%t A082909 Table[Total[Mod[Divisors[n],3]],{n,110}] (* _Harvey P. Dale_, Jan 01 2019 *)
%t A082909 Table[DivisorSum[n,Mod[#,3]&],{n,110}] (* _Harvey P. Dale_, Jan 09 2022 *)
%Y A082909 Cf. A004016, A093061.
%K A082909 nonn
%O A082909 1,2
%A A082909 _N. J. A. Sloane_, Nov 02 2008