Diophantine Equations

The Bézout Identity

Writing GCD of two numbers using only multiplication and addition.
Requirements: Euclidean Algorithm Difficulty: 2

Linear Diophantine Equations

Solving equations of the form $ax + by = c$.
Requirements: The Bézout Identity Difficulty: 2

Pythagorean Triples

Finding all right-angled triangles with integer sides.
Requirements: Algebra Difficulty: 2

Sums of Squares

Which numbers can be written as the sum of two squares? Or four?
Requirements: Modular Arithmetic Difficulty: 3

Fermat's Last Theorem

The story of a 350-year-old problem.
Requirements: General Math Difficulty: 1
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