2020 USAMO Problems/Problem 3
Problem
Let be an odd prime. An integer is called a quadratic non-residue if does not divide for any integer .
Denote by the set of all integers such that , and both and are quadratic non-residues. Calculate the remainder when the product of the elements of is divided by .
Solution
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2020 USAMO (Problems • Resources) | ||
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Followed by Problem 4 | |
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