The least common factor of any set of numbers is 1.
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The common factors of 8 and 100 are: 1, 2, 4.
The greatest common factor of 13 and 79 is 1.
It is not possible to give a sensible answer to this question. Common factors and the greatest common factor (GCF) refers to a factors that are COMMON to two or more numbers. You have only one number in the question!
The GCF is 1.
The GCF is 1.