The least (or lowest) common factor is 1. The lowest common factor of any combination of numbers will be 1. This is because you can divide every number evenly by 1, including prime numbers (which have themselves and 1 as factors).
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The least common factor of any set of integers is 1.
The least common factor of any set of positive integers is 1.
The GCF of 12 and 15 is 3, and the LCM is 60.
The least common factor of any two numbers is 1.
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