Gaps in binary cyclotomic polynomials

Antonio Cafure, Eda Cesaratto

For odd prime numbers $p<q$, let $\hat{I}{¦}_{pq}\in \mathbb{Z}[X]$ be the binary cyclotomic polynomial of order $pq$. In this paper, we prove that the second gap of $\hat{I}{¦}_{pq}$ is the ma…