Kaprekar’s constant : ‘6174 .. is notable for the following property: Take any four-digit number, using at least two different digits. (Leading zeros are allowed.); Arrange the digits in ascending and then in descending order to get two four-digit numbers, adding leading zeros if necessary; Subtract the smaller number from the bigger number; Go back to step 2. The process will reach 6174 in at most 7 iterations’

(tags: 6174 constants cool maths mathematics numbers kaprekar wow)

# Links for 2010-08-02

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## 2 Comments

This seems to be legit. http://pastebin.com/WHCafKpG

I have been wracking my brains trying to figure out what illegitimate maths might be, and failed. This thing has a proof: how could it possibly be wrong? :)