1, 3, 7, 9, 21, 27, 63, and 189
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There are five: 105, 126, 147, 168 and 189.
63, 126, 189, 252, 315.
The multiples of 18 are 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, . . . The multiples of 27 are 27, 54, 81, 108, 135, 162, 189, 216, 243, 270, . . .
21, 42, 63, 84, 105, 126, 147, 168, 189, 210
The lowest common multiple of 7 and 9 is 63. The common multiples of 7 and 9 are therefore the infinite set of multiples of 63. Thus, the common multiples of 7 and 9 are 63, 126, 189, 252, 315, 378, 441, 504, 567, 630, 693, and so on.