The only common factor of four and seven is one, because seven is a Prime number.
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The least common factor of any set of integers is 1.
The least common factor is: 1
The greatest common factor can't be a smaller number than the least common factor, but if you meant least common multiple, 7 and 28 have a GCF of 7 and an LCM of 28.
The least common denominator of 2 and 6 is 6
The least common factor of any set of integers is 1.