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 A363035 #16 Jul 06 2023 07:30:28 %S A363035 0,0,3,0,0,3,8,0,3,0,13,3,0,0,29,0,0,3,23,0,3,0,36,16,0,0,36,0,0,3,46, %T A363035 0,21,0,43,3,13,0,59,0,0,26,53,0,3,0,66,3,0,13,112,0,0,3,76,0,3,0,73, %U A363035 36,0,0,102,0,23,3,83,0,59,0,96,3,0,0,96,13,0,46,134,0,3,0,103,3,0,0,185,23,13,3,113,0,36 %N A363035 Sum of divisors of 5*n-3 of form 5*k+3. %F A363035 a(n) = A284281(5*n-3). %F A363035 G.f.: Sum_{k>0} (5*k-2) * x^(4*k-1) / (1 - x^(5*k-2)). %t A363035 a[n_] := DivisorSum[5*n - 3, # &, Mod[#, 5] == 3 &]; Array[a, 100] (* _Amiram Eldar_, Jul 06 2023 *) %o A363035 (PARI) a(n) = sumdiv(5*n-3, d, (d%5==3)*d); %Y A363035 Cf. A363033, A363034, A363053. %Y A363035 Cf. A284281, A359270, A363157. %K A363035 nonn %O A363035 1,3 %A A363035 _Seiichi Manyama_, Jul 06 2023