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Concept guide



## [The complete nonzero square table modulo 7](/en/derivations/derivation-mko-quadratic-residue-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-quadratic-residue)

Modulo 7, the nonzero quadratic residues are {1,2,4}; the class of -5 equals the class of 2 and has root classes 3 and 4, while 3 has no square root modulo 7.

Quadratic residue

derivation-mko-quadratic-residue-01





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