The greatest (and only) common factor of 4 and 5 is 1.
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5
135 = 33 * 5 315 = 5 * 43 It is 5 because 5 is in both rows. What about 15? Is it the greater common factor?
There is only one common factor of 3, 4 and 5 which is 1.
The greatest common factor of 4 and 5 is 1. The GCF of any consecutive integers is 1.
The least common factor of any set of integers is 1.