A Miraculous Proof (Ptolemy's Theorem) - Numberphile
16:37
Superhero Triangles - Numberphile
26:36
Epic Circles - Numberphile
32:54
Ptolemy’s Theorem and the Almagest: we just found the best visual proof in 2000 years
28:43
The Notorious Question Six (cracked by Induction) - Numberphile
26:51
New divisibility rule! (30,000 of them)
16:39
Way Bigger Than Graham's Number (Goodstein Sequence) - Numberphile
16:24
The Riemann Hypothesis, Explained
41:14