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 A330579 #15 Dec 20 2019 03:52:46 %S A330579 1,4,493,1565,6210,26375,64019,289862,870828,1244485,3313113,4300012, %T A330579 7946206,1447234860,4147639664,7190149312,23828369695,39710847388, %U A330579 494027033160,982853084580,1095174951021,1141650682059,1522735118076,1642938906044 %N A330579 Numbers k such that the k-th composite number divides the sum of the first k composite numbers. %C A330579 This sequence corresponds to the positions of zeros in A330578. %e A330579 The first 4 composite numbers are: 4, 6, 8 and 9. %e A330579 As 4 + 6 + 8 + 9 = 3*9, 4 belongs to the sequence. %o A330579 (PARI) s=0; k=0; forcomposite (c=4, oo, k++; s+=c; if (s%c==0, print1 (k", "))) %Y A330579 Cf. A024011 (prime variant), A330578, A330580. %K A330579 nonn,more %O A330579 1,2 %A A330579 _Rémy Sigrist_, Dec 18 2019 %E A330579 a(15)-a(24) from _Giovanni Resta_, Dec 20 2019