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Self-Descriptive Number

A 10-Digit number satisfying the following property. Number the Digits 0 to 9, and let Digit $n$ be the number of $n$s in the number. There is exactly one such number: 6210001000.


Pickover, C. A. ``Chaos in Ontario.'' Ch. 28 in Keys to Infinity. New York: Wiley, pp. 217-219, 1995.

© 1996-9 Eric W. Weisstein