There are infinitely many common multiples of 7 and 3 and it is not possible to provide a list. They are numbers of the form 21*k where k is an integer.
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42 is the LCM of 3, 6 and 7. All multiples of 42 are multiples of 3, 6 and 7
it's infinite
The common multiples of 3 and 7 are 21, 42, 63 and so on.
There are infinitely many common multiples of 3, 5 and 7, each one 105 larger than the previous one. Or to put it another way: the common multiples of 3, 5 and 7 are the multiples of their lowest common multiple which is 105. ie their common multiples are all the multiples of 105, of which there is no end - there is an infinite number of multiples of 105 (or any other number [except zero]).
The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.