The prime factors of 15, for example, are 3 and 5.

Note that does not have to be a prime factor.

Even if you can figure out the prime factors, it doesn't mean the message would make sense.

None of the first 29 natural numbers have more than two different prime factors.

The prime factors of 384 are 2 (seven times) and 3.

List of prime factors for numbers from 2 - 5 million and growing.

If not, we can at least find all the small prime factors and check that for these.

Continuing in this way, at the end we see that the prime factors of the two products must be exactly the same.

The largest prime factor of N is greater than 10.

"Our prime factor is to deal with education, and we don't want anyone to think anything else."