- Divisibility and the Division Algorithmages 18 to 19 · 14 questions
- Euclid's Algorithm and Bezout's Identityages 18 to 19 · 14 questions
- Modular Arithmetic and Congruence Classesages 19 to 20 · 14 questions
- Linear Congruences and the Chinese Remainder Theoremages 19 to 20 · 16 questions
- Fermat's Little Theorem and Euler's Theoremages 20 to 21 · 14 questions
- Primitive Roots and the Units Modulo nages 20 to 21 · 14 questions
- Quadratic Residues and the Law of Reciprocityages 21 to 22 · 17 questions
- The Distribution of Primes and What Is Still Openages 21 to 22 · 17 questions