What are distinct primes?

Answer 1

They are different prime factors of a number, as opposed to repeated factors.

For example, the prime factorisation of 12 is 2*2*3. The distinct primes of 12 are 2 and 3.

Answer 2

In this case, distinct primes just means "don't repeat any."

The prime factorization of 72 is 2 x 2 x 2 x 3 x 3

The distinct prime factors of 72 are 2 and 3