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Administrative function

Author: mathforces
Problem has been solved: 9 times

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Let $ F_ {2017} $ be the set of all remainders when dividing by $ 2017 $. The function $ f: Z-> F_ {2017} $ is called administrative if there exists $ a \in F_ {2017} $, $ a \neq 0 $ such that $ f (x) f (y) = f (x + y) + a ^ yf (x-y) \ \ (mod \ \ 2017) $ for all $ x, y \ in Z $. Find the number of administrative, periodic functions with the smallest period of 2016?





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