| Interesting... |
Thu, 09 October 2008 12:23  |
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 Ron |
 | Commander
Forum Administrator
Stars! AutoHost Administrator |
Messages: 1231
Registered: October 2002
Location: Collegedale, TN | |
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Select any 4-digit number in which there are at least 2 different digits (e.g. 4474 is OK but not 4444). Arrange the digits in increasing order and also in decreasing order (e.g. chosen number 3395 arranged as 3359 and 9533). Subtract the smaller number from the larger one. Re-arrange the digits of this answer as before - increasing and decreasing order - and again subtract the smaller from the larger. Keep repeating these steps and see what happens.
Ron Miller
Stars! AutoHostReport message to a moderator
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| Re: Interesting... |
Thu, 09 October 2008 18:33  |
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| Effluviant Walrus |
 | Senior Chief Petty Officer |
Messages: 91
Registered: May 2008
Location: New York, US | |
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Hmm, it seems that 0s don't matter. I wrote a simple Python program to test this; all four digit numbers except for 1111,2222,etc. come out to 6174.
[Updated on: Thu, 09 October 2008 18:33] Report message to a moderator
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