A number Puzzle in which a group of arithmetical operations has some or all of its Digits replaced by letters or symbols, and where the original Digits must be found. In such a puzzle, each letter represents a unique digit.

**References**

Bogomolny, A. ``Cryptarithms.'' http://www.cut-the-knot.com/st_crypto.html.

Brooke, M. *One Hundred & Fifty Puzzles in Crypt-Arithmetic.* New York: Dover, 1963.

Kraitchik, M. ``Cryptarithmetic.'' §3.11 in *Mathematical Recreations.* New York: W. W. Norton, pp. 79-83, 1942.

Marks, R. W. *The New Mathematics Dictionary and Handbook.* New York: Bantam Books, 1964.

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1999-05-25