I will put  useful contents for studying mathematical olympiads in this page.

My problem sets

Number Theory Books:

Number Theory Structures, Examples, and Problems – Titu Andreescu and Dorin Andrica

An Introduction to Diophantine Equations – Titu Andreescu, Dorin Andrica, Ion Cucurezeanu

104 Number Theory Problems – Titu Andreescu, Dorin Andrica, Zuming Feng


The following are free books which can be downloaded from this website:

Number Theory – Naoki Sato

Elementary Number Theory – W. Edwin Clark

Numbers and Curves (book draft, Springer, 2001) – Franz Lemmermeyer

Algorithmic Number Theory (web draft, 2002) – S. Arun-Kumar

Elementary Number Theory: Primes, Congruences, and Secrets – William Stein
 250 Problems in Elementary Number Theory – Waclaw Sierpinski

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