The Goat Problem - Numberphile
17:58
Go First Dice - Numberphile
14:51
The Brick Factory Problem - Numberphile
21:05
Why is there no equation for the perimeter of an ellipse‽
16:27
The Search for Siegel Zeros - Numberphile
13:58
The Josephus Problem - Numberphile
17:26
Researchers thought this was a bug (Borwein integrals)
15:31
The Reciprocals of Primes - Numberphile
22:38