36 is the first number with 3 6 and 9 as common factors. thereafter you add 18 which is the smallest common factor for 3 6 and 9
therefore
36
54
72
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84
U={whole number greater than 10 but smaller than 30 } X={numbers divisible by 3 } Y Odd numbers
56 of them.
If the sum of its' digits are divisible by 3 for all numbers greater than 9.
Three of them.