Jacobs, D.P.; Trevisan, V.; Rayers, M.O.
(Algebra and Discrete Mathematics, 2008)
Let Tn(x) be the degree-n Chebyshev polynomial of the first kind. It is known [1,13] that Tp(x)≡xpmodp, when p is an odd prime, and therefore, Tp(a)≡amodp for all a. Our main result is the characterization of composite ...