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The unitary divisors of an integer n are those pairs of integers a and b satisfying ab = n and (a,b) = 1.*

For example, the unitary divisors of 99 are 1, 9, 11 and 99 (but not 3 or 33).

*Here (a,b) denotes, as usual, the greatest common divisor of a and b; thus, the condition (a,b) = 1 means that a and b have no factors in common which are greater than 1.

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