1
340
Since they are both prime numbers - the greatest common factor is 1 !
187
17 and 1
119
Factors of 14: 1, 2, 7, 14 Factors of 17: 1, 17 GCF (14, 17) = 1
255
The GCF is 1.
680
The common factors of 13 and 39 are: 1 and 13
The GCF is 1.
The Greatest Common Factor (GCF) is: 1