21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, . . .
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LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
Two common multiples of 21 and 15 are 105 and 315.
Multiples? There are an infinite amount. Factors on the other hand, there are: 1, 3, 7 and 21.
The four multiples of seven are 7, 14, 21, and 28.