15 and 7
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The numbers could be 7 and 15 whose LCM is 105
Both of these numbers are divisible by 3 and 7. The factors of 105 is 21 x 5 and that of 147 is 21 x 7. So the LCM is 21 x 35 = 735.
The LCM is 1155.
The LCM is 315.
The LCM is 1155.