Journal of the Ramanujan Mathematical Society

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Neighboring Ternary Cyclotomic Coefficients Differ by at Most One


Affiliations
1 I2 Bis Rue Perrey, 31400 Toulouse, France
2 Max-Planck-Institut Fur Mathematik, Vivatsgasse 7, D-53111 Bonn, Germany
     

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A cyclotomic polynomial Φn(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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  • Neighboring Ternary Cyclotomic Coefficients Differ by at Most One

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Authors

Yves Gallot
I2 Bis Rue Perrey, 31400 Toulouse, France
Pieter Moree
Max-Planck-Institut Fur Mathematik, Vivatsgasse 7, D-53111 Bonn, Germany

Abstract


A cyclotomic polynomial Φn(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.