If the period of a Repeating Decimal for has an Even number of digits, the sum of the two halves is a string of 9s, where is Prime and is a Reduced Fraction.

**References**

Rademacher, H. and Toeplitz, O. *The Enjoyment of Mathematics: Selections from Mathematics for the Amateur.*
Princeton, NJ: Princeton University Press, pp. 158-160, 1957.

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1999-05-26