On the middle coefficient of $\Phi _{3p_2p_3}$

On Arithmetic Progressions of Powers in Cyclotomic Polynomials

“…By [15,Remark 2.2], in the study of cyclotomic polynomials, we can reduce our enquiry to the case when n is odd, square-free and composite. Much work has been done to characterize Φ n (see [2,3,4,10,12,13,15]), and many nice results are achieved when n has a small number of prime divisors (see [1,5,6,7,9,11]). In particular, Lam and Leung [11] gave an explicit formula for Φ pq…”