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%I #6 Nov 05 2017 13:21:11
%S 1,3,5,7,11,13,15,17,19,21,23,29,31,33,35,37,39,41,43,47,51,53,55,57,
%T 59,61,65,67,69,71,73,77,79,83,85,87,89,91,93,95,97,101,103,107,109,
%U 111,113,115,119,123,127,129,131,133,137,139,141,143,145,149,151,155,157
%N Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) has height 1.
%C The height of a polynomial is the maximum of the absolute value of its coefficients. Polynomials of height 1 are also called flat polynomials. This sequence includes prime (first order) and semiprime (second order) n, as well as third-order (A117223), fourth-order (A117318) and higher-order n.
%H T. D. Noe, <a href="/A152955/b152955.txt">Table of n, a(n) for n = 1..1000</a>
%o (PARI) is(n)=issquarefree(n) && n%2 && vecmax(abs(Vec(polcyclo(n))))==1 \\ _Charles R Greathouse IV_, Nov 05 2017
%Y Cf. A152940, A152941, A152942, A152943.
%K nonn
%O 1,2
%A _T. D. Noe_, Dec 16 2008
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