14 21 28
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3, 9, and 15. 6 and 18 are also multiples of 3, but are even.
12, 24, 36, 48.
Here are all 13 of them: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195
They're all multiples of 1, 2, 3 and 6.
6, 12, 18, 24, 30, 36, 42, 48, 54 and 60 (including 60) are all even multiples of three below 60.