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Kaprekar numbers: Difference between revisions
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m (→{{header|REXX}}: incorporated userid Vbustos' (for Maple) idea of testing for a number modulus 9 being greater than 1 as a filter. This increased the speed by 28%.) |
m (→{{header|Maple}}: Move text outside of code section.) |
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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.
▲<lang Maple>
isKaprekar := proc(n::posint)
local holder, square, num_of_digits, k, left, right;
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