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 A363891 #20 Jun 27 2023 09:16:53
%S A363891 0,2,0,7,0,10,0,13,5,16,0,19,0,35,0,25,0,28,16,31,0,42,0,56,0,40,0,43,
%T A363891 22,65,0,49,0,77,0,55,0,80,28,61,11,64,0,98,0,95,0,73,34,76,0,104,0,
%U A363891 147,0,85,0,88,40,91,0,125,28,140,0,114,0,103,46,140,0,109,0,192,0,115,0
%N A363891 Sum of divisors of 3*n-2 of form 3*k+2.
%H A363891 Seiichi Manyama, <a href="/A363891/b363891.txt">Table of n, a(n) for n = 1..10000</a>
%F A363891 a(n) = A078182(3*n-2).
%F A363891 G.f.: Sum_{k>0} (3*k-1) * x^(2*k)/(1 - x^(3*k-1)).
%t A363891 a[n_] := DivisorSum[3*n - 2, # &, Mod[#, 3] == 2 &]; Array[a, 100] (* _Amiram Eldar_, Jun 26 2023 *)
%o A363891 (PARI) a(n) = sumdiv(3*n-2, d, (d%3==2)*d);
%Y A363891 Cf. A363514, A363889, A363890.
%Y A363891 Cf. A078182, A359239.
%K A363891 nonn
%O A363891 1,2
%A A363891 _Seiichi Manyama_, Jun 26 2023