2, 3, 5
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Prime factors of 18 are 2 and 3 Prime factors of 15 are 3 and 5
Prime factors of 36 are 2 and 3 Prime factors of 60 are 2, 3 and 5
The prime factors of 12 are 2 x 2 x 3. The prime factors of 15 are 3 x 5.
The factors of 39 are: 1 3 13 39 The prime factors are: 3 and 13
The prime factors of 105 are 3, 5, and 7.The prime factors of 126 are 2, 3, 3, and 7.Therefore the prime factors that 105 and 126 have in common are 3, and 7.