63, 126 and 189 and the first three I can think of. Confirmed in excel.
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140,280,420
The least common multiples of 7 and 14 are 14,28 and 42>
Common multiples of 7 and 5 include 35, 70, 140, etc.
Here are some common multiples of 12 and 7 84, 168, 1008 and 12096.
The first 3 multiples of 7 are: 7, 14, and 21.