1, 3, 13, 39.
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1, 7, 49.
The prime factors of 39 are 3 and 13.
39*3=117 39*5=195
Oh, dude, that's an easy one. So, what can go into 21 and 39? Well, technically, the numbers that can go into both 21 and 39 are 1 and 3. Like, it's not rocket science, but hey, math can be a little sneaky sometimes.
The prime numbers (factors) of 39 are: 3 and 13