Here are some multiples of both 15 and 7: 105, 210, 315, 420, 525, 630, 735, 840, 945.
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They are all multiples of 3.
They are: 9, 18, 27, 36, and 45 They are: 15, 30 and 45
Here are all 13 of them: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195
The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.
There are infinitely many multiples of 9 and 21 so it is impossible to list them. One of their multiples is 9*21 = 189.