1, 3, 5, 15
3 and 5 are prime.
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2 x 3 x 7 = 42
15 is not a prime number, so it can't be a prime factor.
I suggest you try to factor that, then sort the factors in ascending order. Then you can subtract the two largest factors. ------------------------------------ The prime fractorization of 33660 is 2² × 3² × 5 × 11 × 17. The two greatest prime factors are 11 and 17, so their difference is 17 - 11 = 6.
The Prime Factors of 15 are 3, 5
Factors of 15 are: 1 3 5 and 15 of which 3 and 5 are prime factors