Movie: The solitude of Prime numbers (La solitudine dei numeri primi)

Prime numbers are divisible only by one and themselves. They're special numbers, suspicious and solitary. Some Prime numbers are even more special: they are called "twin primes", a pair of Prime numbers that only differ by 2, like 11 and 13 or 17 and 19. But twin primes never touch because they're always separated by an even number.