For which primes p > 7 is 7 a square mod p? Your answer should be...

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For which primes p > 7 is 7 a square mod p? Your answer should be of the form p = {a1, a2, ... , ar} mod n, where a, E {1,...,n -1} for all i = 1, ...,k. mod For which primes p > 7 is 7 a square mod p? Your answer should be of the form p = {a1, a2, ... , ar} mod n, where a, E {1,...,n -1} for all i = 1, ...,k. mod