Question: 5. For and odd prime p. Let f(p) be the number of solutions of the congruence y? = 23 -r (mod p). Find all prime

5. For and odd prime p. Let f(p) be the number of
5. For and odd prime p. Let f(p) be the number of solutions of the congruence y? = 23 -r (mod p). Find all prime p such that f (p) = p

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