66 is the first one
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The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 . . .
3, 6, 9, 12, 15, 18 4, 8, 12, 16, 20, 24 6, 12, 18, 24, 30, 36 Common multiples include 12, 24, 36, 48, 60, 72
3, 9, and 15. 6 and 18 are also multiples of 3, but are even.
Multiples of 6 must also be multiples of 1, 2 and 3.