WebsitebeginnerFree
Art of Problem Solving
Unknown
Free number theory problems and wiki
More resources on Number Theory
WebsiteFree
Quanta Magazine - Mathematics
High-quality journalism on cutting-edge mathematical research making advanced topics accessible to mathematically literate non-specialists.
WebsiteFree
Wolfram MathWorld
Comprehensive mathematics encyclopedia covering definitions, formulas, theorems, and visualizations across pure and applied mathematics.
YouTubeFree
Mathologer
Deep mathematical explorations covering number theory, geometry, combinatorics, and recreational mathematics with rigorous proofs.
VideoFree
Fermat's Little Theorem Proof
blackpenredpen's clear explanation
CourseFree
Elementary Number Theory
Explore the beauty of numbers! This elementary number theory course covers divisibility, primes, congruences, and more.
CourseFree
Number Theory I
Learn the fundamentals of number theory with MIT's Number Theory I course by Andrew Sutherland. Explore integers, divisibility, and more!