2, 3 and 6.
There is also 1 and 9.
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54 and 72 are divisible by 2,3.
36, 54 and 72
There are five numbers: 18, 36, 54, 72, 90.
Numbers that are divisible by 9 are multiples of nine. 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 etc... Any other numbers are "not" divisible by 9.
Any number of the form 18*k where k is an integer.