!Fancy FE
Author: anonymous
Problem has been solved: 9 times
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Find the number of functions $f: N \to \{0,1,...,16\}$ having a period of 17 and $f(x)^2-f(x^2) \equiv 2 \pmod {17}$ for all positive integers $ x $.
Найдите количество функций $f: N \to \{0,1,...,16\}$ имеющих период длинной в 17 и $f(x)^2-f(x^2) \equiv 2 \pmod {17}$ для всех натуральных $x$.
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