1, 3, 7, 21.
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The numbers that go into 21 evenly are 1, 3, 7, 21.
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.
It is a pattern. Go up two numbers, go down two numbers.
1, 3, 7, 9, 21, 63.
1, 3, 7, 13, 21, 39, 91, 273.