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If there exist an integer x such that x^2 ≡ q (mod n). then q is called ______________

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If there exist an integer x such that x^2 ≡ q (mod n). then q is called ______________

(a) Quadratic Residue

(b) Linear Residue

(c) Pseudoprime

(d) None of the mentioned

This question was posed to me during an online exam.

This intriguing question comes from Number Theory in section Number Theory and Cryptography of Discrete Mathematics

1 Answer

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Best answer
Correct option is (a) Quadratic Residue

To elaborate: q is called quadratic residue if it is congruent to a perfect square modulo n.

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