Neighboring ternary cyclotomic coefficients differ by at most one

Details Neighboring ternary cyclotomic coefficients differ by at most one Neighboring ternary cyclotomic coefficients differ by at most one

2008-10-30

arxiv.org/abs/0810.5496v1

Mathematics

Number Theory

11 pages, 2 tables

Scientific paper

A cyclotomic polynomial Phi_n(x) is said to be ternary if n=pqr with p,q and r distinct odd prime factors. Ternary cyclotomic polynomials are the simplest ones for which the behaviour of the coefficients is not completely understood. Eli Leher showed in 2007 that neighboring ternary cyclotomic coefficients differ by at most four. We show that, in fact, they differ by at most one. Consequently, the set of coefficients occurring in a ternary cyclotomic polynomial consists of consecutive integers. As an application we reprove in a simpler way a result of Bachman from 2004 on ternary cyclotomic polynomials with an optimally large set of coefficients.

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