That Viral Math Problem (Cheryl's Birthday) - Numberphile
13:31
Randomness is Random - Numberphile
9:07
The Square-Sum Problem - Numberphile
26:51
New divisibility rule! (30,000 of them)
13:38
5040 and other Anti-Prime Numbers - Numberphile
19:37
Por que esse quebra-cabeça é impossível
16:52
Rotation without rotating.
13:32
Glitch Primes and Cyclops Numbers - Numberphile
10:13