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1 and 71
Its only factors are itself and one because 71 is a prime number
The GCF of 15 and 71 is 1.
The gcf of 53 and 71 is 1 - b'cos 53 is a prime ( so is 71)
With the possible exception of a pair of pants or a pair of scissors. 71 is a single number. 7 and 1 is a factor pair of 7.