The prime factors of 60 are 2, 2, 3, and 5.
The prime factors of 105 are 3, 5, and 7.
The prime numbers that are factors of both 60 and 105 are 3 and 5.
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Both 61 and 67 are prime numbers themselves, therefore their factors are 1 and themselves, which are obviously both prime as well.
They're both integers.
3,7,5
No because they are both composite numbers having more than two factors whereas prime numbers have only two factors
I would consider both prime and composite factors - depending on what was required.