Any even exponent of 3 is a square number.
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That's not going to work. Multiples of 5 end in 5 or 0. With three numbers, one of those would have to repeat.
2, 4, 6
They are multiples of 1, 3 and 9.
Well, honey, the common multiples of 4, 8, and 16 are numbers that all three can divide evenly into. So, the first few common multiples would be 16, 32, 48, and so on. Just keep adding 16 to get more of those bad boys. Happy counting!
Factors go into numbers, numbers go into multiples.