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33 and 39

The way to do this is to see which odd numbers between 30 and 40 have digits that add up to a multiple of 3 since this is the test to see if a number is divisible by 3.
So 33 has digits that add to 6 since 3+3=6 and 33 is odd
Also, 39 has digits that add up to 12 since 3+=12 and 39 is odd.


36 has digits that add to 9, but it is even so we discard it.

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15y ago

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