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You should subtract in powers with the base of 3

The smallest number less than 23 is 32 or 9

The smallest multiple of 9 less than 23 is 18 ( 2 X 9 ), so 2 is your first number

23 - 18 = 5

The smallest number less than 5 is 31 or 3

The smallest multiple of 3 less than 5 is 1 ( 1 X 3 ), so 1 is your next number

5 - 3 = 2

So the answer is 212

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Q: What is 23 in base 3?
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