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 A364093 #15 Jul 17 2023 00:58:22 %S A364093 1,1,1,7,1,1,12,1,1,23,1,1,22,1,1,33,1,12,32,1,1,43,1,1,42,17,1,53,12, %T A364093 1,52,1,1,84,1,1,62,1,1,84,1,43,72,1,1,83,1,1,82,32,12,93,1,1,113,1,1, %U A364093 155,1,1,102,12,1,113,1,42,112,27,1,123,1,1,133,63,1,154,1,1,132,1,32,194,1,12,142 %N A364093 Sum of divisors of 5*n-2 of form 5*k+1. %F A364093 a(n) = A284097(5*n-2). %F A364093 G.f.: Sum_{k>0} (5*k-4) * x^(3*k-2) / (1 - x^(5*k-4)). %t A364093 a[n_] := DivisorSum[5*n - 2, # &, Mod[#, 5] == 1 &]; Array[a, 100] (* _Amiram Eldar_, Jul 17 2023 *) %o A364093 (PARI) a(n) = sumdiv(5*n-2, d, (d%5==1)*d); %Y A364093 Cf. A364092, A364094, A364095. %Y A364093 Cf. A284097, A359236, A364097. %K A364093 nonn %O A364093 1,4 %A A364093 _Seiichi Manyama_, Jul 04 2023