If you mean numbers both 6 and 9 divide evenly, then start with the least common multiple. 6 and 9 are both divisible by 3, so it's 6 * 9 / 3 = 18. So the first six multiples would be:
18
36
54
72
90
108
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The lowest multiple of 6 and 9 is 18, since it is the smallest number that is divisible by both 6 and 9.
The least common multiple of 9, 6, and 16 is 144.
The least common multiple of 9 , 4 , 6 = 3
Out of that list, just 1, 2 and 5.