Anonymous user
Kaprekar numbers: Difference between revisions
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=={{header|Maple}}==
<lang Maple>
For a number x to be Kaprekar, it must have x^2 congruent to x mod 9.
Which is only achievable when x has remainder 1 or 0 mod 9. So we only check for these cases.
isKaprekar := proc(n::posint)
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