Determine whether -104 is a quadratic residue or non residue of the prime 997.
(−104|997) = (−1 × 2 × 13|997)
= (−1|997)(2|997)(13|997)
= −(13|997)
= (997|13)
= −(9|13)
= −1
Therefore −104 is a quadratic nonresidue of 997.
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