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Kaprekar numbers

A Kaprekar number has a square that can be split into parts whose sum is the original number.

The first few kaprekar numbers are: 9, 10, 45, 55, 99, 100, 297, 703, 999, 1000, 2223, …

59 of the first one million positive integers are kaprekar.

Learn more about kaprekar numbers on wikipedia.

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