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 A363887 #11 Jun 26 2023 06:33:16
%S A363887 0,1,0,0,2,0,0,2,0,0,2,0,0,2,1,0,2,0,0,2,0,0,2,0,2,2,0,0,2,0,0,2,0,0,
%T A363887 4,0,0,2,0,0,2,1,0,2,2,0,2,0,0,2,0,0,2,0,2,2,0,0,4,0,0,2,0,0,4,0,0,2,
%U A363887 0,0,2,0,0,2,2,2,2,0,0,2,0,0,3,0,2,2,0,0,2,0,0,2,2,0,4,0,0,2,0,0
%N A363887 Number of divisors of 7*n-5 of form 7*k+3.
%F A363887 a(n) = A363805(7*n-5).
%F A363887 G.f.: Sum_{k>0} x^(3*k-1)/(1 - x^(7*k-4)).
%t A363887 a[n_] := DivisorSum[7*n - 5, 1 &, Mod[#, 7] == 3 &]; Array[a, 100] (* _Amiram Eldar_, Jun 26 2023 *)
%o A363887 (PARI) a(n) = sumdiv(7*n-5, d, d%7==3);
%Y A363887 Cf. A363852, A363857, A363888.
%Y A363887 Cf. A363805.
%K A363887 nonn
%O A363887 1,5
%A A363887 _Seiichi Manyama_, Jun 26 2023