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Linear recurrence relations for binomial coefficients modulo a prime
Authors:Sandro Mattarei
Institution:Dipartimento di Matematica, Università degli Studi di Trento, via Sommarive 14, I-38050 Povo (Trento), Italy
Abstract:We investigate when the sequence of binomial coefficients View the MathML source modulo a prime p, for a fixed positive integer k, satisfies a linear recurrence relation of (positive) degree h in the finite range 0?i?k. In particular, we prove that this cannot occur if 2h?k<ph. This hypothesis can be weakened to 2h?k<p if we assume, in addition, that the characteristic polynomial of the relation does not have −1 as a root. We apply our results to recover a known bound for the number of points of a Fermat curve over a finite field.
Keywords:primary  11B65  secondary  05A10
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