In number theory, Kaprekar’s routine is an iterative algorithm named after its inventor, Indian mathematician D. R. Kaprekar. Each iteration starts with a four-digit random number, sorts the digits into descending and ascending order, and calculates the difference between the two new numbers.
In number theory, Kaprekar’s routine is an iterative algorithm named after its inventor, Indian mathematician D. R. Kaprekar. Each iteration starts with a four-digit random number, sorts the digits into descending and ascending order, and calculates the difference between the two new numbers.
Source: Wikipedia "Kaprekar's routine" · CC BY-SA 4.0
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