login
A152940
Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) has height 2.
7
105, 165, 195, 255, 273, 285, 345, 357, 429, 455, 555, 561, 609, 615, 627, 645, 705, 715, 759, 777, 795, 805, 897, 957, 969, 987, 1001, 1005, 1015, 1023, 1045, 1065, 1085, 1095, 1105, 1131, 1185, 1221, 1239, 1245, 1265, 1295, 1407, 1419, 1435, 1455, 1491
OFFSET
1,1
COMMENTS
The height of a polynomial is the maximum of the absolute value of its coefficients. Subsequence of A154430.
PROG
(PARI) is(n)=issquarefree(n) && n%2 && vecmax(abs(Vec(polcyclo(n))))==2 \\ Charles R Greathouse IV, Nov 05 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Dec 16 2008, Jan 09 2009
STATUS
approved