S1, E3: A number is prime if it is evenly divisible by only itself and the number one; Professor Benjamin proves that there are an infinite number of primes; how primes are the building blocks of the number system.

S1, E3: A number is prime if it is evenly divisible by only itself and the number one; Professor Benjamin proves that there are an infinite number of primes; how primes are the building blocks of the number system.