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How many qualified numbers? (
Posted on 20190424
)
If a square number has a digit sum of 2019, that number is called a qualified number. How many qualified numbers are there?
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Submitted by
Danish Ahmed Khan
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The digital root of 2019 is 3 and is therefore divisible by 3 but not my 9 and so can't be square, so there are no such numbers.
Posted by
Charlie
on 20190424 11:57:48
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