Talk:Kaprekar number

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Following the description on this page, how can 1 be a Kaprekar number? One squared is one, which cannot be split in to two one-digit numbers.

Therefore, either one is not a Kaprekar number, or the description on this page needs a special case for the number one. --Dan Huby 14:55, 6 Apr 2004 (UTC)

According to http://www.math.uwaterloo.ca/JIS/VOL3/iann2a.html, the two split digits don't have to be the same size, and one can be zero-length, if I've read it correctly. Which gives a case for one. But then the text on this page needs extending. --Dan Huby 15:11, 6 Apr 2004 (UTC)

[edit] Usefulness

What is the usefulness of a Kaprekar number? - Zepheus (ツィフィアス) 17:17, 3 August 2006 (UTC)