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 A111321 #11 May 14 2024 03:58:55
%S A111321 5,8,13,22,33,40,47,50,56,63,72,84,86,104,106,110,115,126,128,139,148,
%T A111321 150,154,157,160,180,184,186,188,200,209,220,228,230,232,236,238,240,
%U A111321 244,253,270,274,300,302,305,322,324,331,339,354,367,371,384,415,417,420,428,433
%N A111321 Numbers k such that 7 divides prime(1) + ... + prime(k).
%H A111321 Amiram Eldar, <a href="/A111321/b111321.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Harvey P. Dale)
%t A111321 Position[Accumulate[Prime[Range[500]]],_?(Divisible[#,7]&)]//Flatten (* _Harvey P. Dale_, Oct 06 2017 *)
%o A111321 (PARI) lista(pmax) = {my(s = 0, k = 0); forprime(p = 2, pmax, k++; s += p; if(!(s % 7), print1(k, ", ")));} \\ _Amiram Eldar_, May 14 2024
%Y A111321 Cf. A007504, A103208, A111318, A111319, A111320, A111322, A111323, A111324, A111325, A111326, A111327.
%K A111321 nonn
%O A111321 1,1
%A A111321 _N. J. A. Sloane_, Nov 05 2005