12, 16 and 18.
(12,1)(6,2)(4,3)
(16,1)(8,2)(4,4)
(18,1)(9,2)(6,3)
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All of the composite numbers less than 100 have factor pairs.
2 5 6
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
Yes.
3,9,27,81,243,729