9, 18, 27.
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There are infinitely many of them and so it is not possible to list them. They are numbers of the form 9*k where k is an integer.
1, 3 and 9 are common factors of 27, 45 and 81. 27, 45 and 81 are multiples of 1, 3 and 9.
Any multiple of 18.
The first 3 multiples of 4 are: 4, 8, and 12.The first 3 multiples of 9 are: 9, 18, and 27.
They are all multiples of 3.