3,6,9,12,15,18,21,24,27,30
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Any number that is a multiple of 3 has 3 as a factor.
There are an infinite number of numbers with 3 as a factor. Any number evenly divisible by 3 has 3 as a factor. That means 6, 9, 12, 15, 18, ..., all have 3 as a factor.
3
There are infinite numbers, but 10 is a factor of 20,30, 40, 50, etc.
Whatever isn't 1, 2, 3, 5, 6, 10, 15, 30