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The answers given thus far all fail on numbers (such as 100 and 211) which generate two-digit numbers in their intermediate results. Here's a good test for this particular golf:
$| = 1; for (100..999) { next if /(.)\1\1/; print "$_ : ", k($_), $/; }
And here's a correct solution at 74 68 63 chars:
sub k { $_=sprintf"%03d",pop;/495/?0:1+k(-($_=join'',sort/./g)+reverse) }
   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to Re: (Golf) Kaprekar's Process by MeowChow
in thread (Golf) Kaprekar's Process by srawls

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