3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 . . .
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The first 3 multiples of 13 are: 13, 26, and 39.
66 is the first one
The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.
The answer would be 750,000.
18, 36, 54, 72, 90.