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Tuesday, September 14, 2010

Number Digit Puzzle

Can you find a 10 digit number such that:
  • the 1st digit tells how many zeros are in the number, 
  • the 2nd digit tells how many 1's are in the number,
  • the 3rd digit tells how many 2's are in the number,
  • the 4th digit tells how many 3's are in the number, etc. etc. (10th digit tells how many 9's are in no.)
 answer below....
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answer: 6210001000

This is called a "self-descriptive number," BTW, and it is the only one in base 10.

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