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Unitary divisor
A number a is a unitary divisor of a number b if a and frac{b}{a} have only one common factor (1). Thus, 5 is a unitary divisor of 60, because 5 and frac{60}{5}=12 have only one as a common factor, while 6 is a divisor but not a unitary divisor of 60, as 6 and frac{60}{6}=10 have common factors other than 1 (such as 2).
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