2. Exercise §4.3 #36c. Find congruences characterizing all prime numbers p for which the following integers are quadratic residues modulo p (as has been done with -2, 3, and -3 in Exercise 35). (c) 7

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Extracted text: 2. Exercise §4.3 #36c. Find congruences characterizing all prime numbers p for which the following integers are quadratic residues modulo p (as has been done with -2, 3, and -3 in Exercise 35). (c) 7