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 A086794 #11 Feb 24 2024 01:06:27
%S A086794 21,42,63,84,126,147,168,189,252,294,336,378,441,504,567,588,672,756,
%T A086794 882,1008,1029,1134,1176,1323,1344,1512,1701,1764,2016,2058,2268,2352,
%U A086794 2646,2688,3024,3087,3402,3528,3969,4032,4116,4536,4704,5103,5292
%N A086794 Numbers k such that the k-th cyclotomic polynomial has exactly 9 nonzero terms.
%F A086794 {k : A051664(k) = 9}. - _R. J. Mathar_, Sep 15 2012
%Y A086794 Cf. A086779.
%K A086794 nonn
%O A086794 1,1
%A A086794 Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 05 2003