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

**References**

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

© 1996-9

1999-05-26