2 x 3 x 5
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2,3,5
31 and 37 are the only prime numbers between 30 and 40
The factors of 30 that are not prime numbers are 6, 10 and 30.
The prime factors of 20 are 2 and 5. The prime factors of 30 are 2, 3 and 5.
Factors can be prime or composite. The factors of 30 are 1,2,3,5,6,10,15 and 30. Of these, 3 and 5 are prime. The rest are composite except for 1, which is neither.