Mathologer
by Burkard Polster · YouTube
Deep mathematical explorations covering number theory, geometry, combinatorics, and recreational mathematics with rigorous proofs.
More resources on Number Theory
numbertheory.org
Numbertheory.org is a comprehensive online hub for learning number theory, offering curated tutorials, lecture notes, bibliographies, and a wide collection of links to papers, software, and related resources.
Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
primes.utm.edu
Primes.utm.edu, The Prime Pages, is a comprehensive number theory resource focused on primes, offering extensive prime catalogs (including Mersenne primes), historical notes, tables, and references to algorithms, software, and research data.
This Week's Finds in Mathematical Physics, Week 201
John Baez's 2004 expository column introducing Galois theory through symmetry: Galois groups of field extensions, quadratic and cyclotomic number fields, the fundamental theorem, why the quintic has no radical solution, and classical construction problems, with pointers toward class field theory.
Elementary Number Theory
Explore the beauty of numbers! This elementary number theory course covers divisibility, primes, congruences, and more.
Art of Problem Solving Number Theory
Community-maintained wiki pages on divisibility, modular arithmetic, Diophantine equations and related olympiad topics, each paired with worked contest problems. Working through them builds the pattern recognition competition number theory questions demand.