Forget 42

[Robert Slade <rmslade () shaw ca>]

(Or even 85.4)

6174 is *much* freakier

http://www.improbable.com/2012/02/17/that-man-kaprekar-and-his-damned-number/

Choose a four digit number where the digits are not all the same (that is, not 1111, 2222, …). Then rearrange the 
digits to get the largest and smallest numbers these digits can make. Subtract the smallest number from the largest to 
get a new number, and carry on repeating the operation for each new number.

(Don't worry.  It'll stop.  The Turing tape ends ...)
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