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 A160497 #2 Mar 30 2012 17:22:54 %S A160497 15,35,65,77,85,91,95,115,119,133,143,161,185,187,209,215,217,221,235, %T A160497 247,259,265,287,299,319,323,329,335,341,365,371,377,391,403,407,413, %U A160497 415,427,437,451,469,473,481,485,493,511,515,517,527 %N A160497 Values of pq such that there are only two residue classes (mod pq) of primes r that produce flat cyclotomic polynomial Phi(pqr,x). %C A160497 Except for 91, 95, 287, and 473, it appears that for prime p>3, pq is here only if q-1 and q+1 are not multiples of p. %Y A160497 A160496 %K A160497 nonn %O A160497 1,1 %A A160497 _T. D. Noe_, May 15 2009