Just 72.
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The multiples of 3 between 1 and 22 are: 3,6,9,12,15,18,21.
3 + 43 = 46 7 squared = 49 46 + 49 = 95
Each of these is correct: 54, 63, 72, 81 and 90.
There are 3,333 multiples of three that fall between 1 and 10,000.
multiples of 3 ... 21, 24, 27, 30 (between means leave out 30 multiples of 6 ... 24, 30 so the answer is 24