They are: 3*5*7 = 105
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The prime numbers (factors) of 105 are: 3,5,7
3, 5 and 7
They are: 3*5*7 = 105
The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, and 105 3, 5, and 7 are prime numbers. That's three. Technically, ' 1 ' isn't defined as a prime number, although you'd certainly think it should be.