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 A363053 #30 Jul 06 2023 07:30:36
%S A363053 0,3,0,8,3,13,0,21,0,23,3,36,0,36,0,38,3,43,13,59,0,53,3,58,0,84,0,76,
%T A363053 3,73,0,94,23,83,3,96,0,96,0,126,3,103,0,137,13,113,36,118,0,126,0,
%U A363053 136,3,171,0,164,0,156,3,156,43,174,0,158,3,163,0,255,0,173,16,178,0,186,53,196,3,193,23,252
%N A363053 Sum of divisors of 5*n-4 of form 5*k+3.
%F A363053 a(n) = A284281(5*n-4).
%F A363053 G.f.: Sum_{k>0} (5*k-2) * x^(2*k) / (1 - x^(5*k-2)).
%t A363053 a[n_] := DivisorSum[5*n - 4, # &, Mod[#, 5] == 3 &]; Array[a, 100] (* _Amiram Eldar_, Jul 06 2023 *)
%o A363053 (PARI) a(n) = sumdiv(5*n-4, d, (d%5==3)*d);
%Y A363053 Cf. A363033, A363034, A363035.
%Y A363053 Cf. A284281, A359244, A363158.
%K A363053 nonn
%O A363053 1,2
%A A363053 _Seiichi Manyama_, Jul 06 2023