2, 3, 5 are prime numbers but 9 is not a Prime number
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2 3 5 are prime numbers.
The prime factors are: 2 3 5
120 = 2*2*2*3*5, so there is 5 prime numbers, no 2 prime numbers
The factors of 30 and 60 include the prime numbers 2, 3, and 5.
2 and 5 are the only prime numbers which differ by 3.