18:31

The Light Switch Problem - Numberphile

17:05

70 is weird

16:46

Witness Numbers (and the truthful 1,662,803) - Numberphile

8:09

Untouchable Numbers - Numberphile

30:01

The ALMOST Perfect Numbers

30:42

Pi hiding in prime regularities

13:48

Squaring Primes - Numberphile

16:38

A number NOBODY has thought of - Numberphile