Source: wikibot/kaprekar-number
= Kaprekar number
{wiki=Kaprekar_number}
A Kaprekar number is a special kind of number in recreational number theory. A non-negative integer \\( n \\) is called a Kaprekar number if the following condition holds: 1. Square the number \\( n \\) (calculating \\( n^2 \\)). 2. Split the resulting square into two parts: the right part containing \\( d \\) digits (where \\( d \\) is the number of digits in \\( n \\)), and the left part containing the remaining digits.