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%I #6 Nov 05 2017 13:18:37
%S 105,165,195,255,273,285,345,357,429,455,555,561,609,615,627,645,705,
%T 715,759,777,795,805,897,957,969,987,1001,1005,1015,1023,1045,1065,
%U 1085,1095,1105,1131,1185,1221,1239,1245,1265,1295,1407,1419,1435,1455,1491
%N Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) has height 2.
%C The height of a polynomial is the maximum of the absolute value of its coefficients. Subsequence of A154430.
%H T. D. Noe, <a href="/A152940/b152940.txt">Table of n, a(n) for n = 1..1000</a>
%o (PARI) is(n)=issquarefree(n) && n%2 && vecmax(abs(Vec(polcyclo(n))))==2 \\ _Charles R Greathouse IV_, Nov 05 2017
%Y Cf. A152955, A152941, A152942, A152943.
%K nonn
%O 1,1
%A _T. D. Noe_, Dec 16 2008, Jan 09 2009
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