An Introduction to the Theory of Numbers
by Ivan Niven, Herbert S. Zuckerman, Hugh L. Montgomery · Ivan Niven, Herbert S. Zuckerman
Classic Wiley text spanning divisibility, congruences, quadratic reciprocity, Diophantine equations, continued fractions, and analytic estimates on prime distribution. Dense and proof-heavy, it suits a reader who already has some comfort writing rigorous arguments.
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