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 A066986 #13 Apr 06 2020 03:12:22
%S A066986 1,3,6,21,189,252,945,361179,1083537
%N A066986 Integers of the form (Product_{i=1..k} sigma(i))/(Product_{i=1..k} phi(i)) = A066780(k)/A001088(k).
%C A066986 If next term exists, it will be too large to be included.
%C A066986 A066780(k)/A001088(k) is an integer for k = 1, 2, 3, 4, 6, 7, 8, 14, 15, ... Is there such a k greater than 10^5 ? - _Jinyuan Wang_, Apr 06 2020
%Y A066986 Cf. A001088, A066780.
%K A066986 nonn
%O A066986 1,2
%A A066986 _Benoit Cloitre_, Jan 27 2002