Let a Divisor of be called a 1-ary divisor if . Then is called a -ary divisor of , written , if the Greatest Common -ary divisor of and is 1.

In this notation, is written , and is written . is an Infinary Divisor of (with ) if .

**References**

Guy, R. K. *Unsolved Problems in Number Theory, 2nd ed.* New York: Springer-Verlag, p. 54, 1994.

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1999-05-26