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Kaprekar 6174 Explorer

Sort, subtract, and repeat a four-digit number while every Kaprekar step stays visible.

Follow a number to 6174

Sort the four digits high-to-low and low-to-high, subtract, keep leading zeros, and repeat.

Method and limits

This is the Kaprekar four-digit routine in base 10. It is a mathematical digit process, not a lucky-number or prediction method.

Kaprekar reference: MacTutor History of Mathematics.

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