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Is 5 a quadratic residue modulo 7?
Which of these is the set of non-quadratic residues modulo 111111?
Which of these is the set of quadratic residues modulo 151515?
Find the sum of all positive integers x<22x<22 x<22 such that x2≡17(mod22)x^2 \equiv 17 \pmod {22} x2≡17(mod22).
Is 151515 a quadratic residue modulo 171717?
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