Iteration of Quadratic Polynomials Over Finite Fields

Published 10 Jan 2017 in math.NT | (1701.02707v2)

Abstract: For a finite field of odd cardinality $q$, we show that the sequence of iterates of $aX^2+c$, starting at $0$, always recurs after $O(q/\log\log q)$ steps. For $X^2+1$ the same is true for any starting value. We suggest that the traditional "Birthday Paradox" model is inappropriate for iterates of $X^3+c$, when $q$ is 2 mod 3.

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Authors (1)

D. R. Heath-Brown

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