340
Since they are both prime numbers - the greatest common factor is 1 !
Factors of 14: 1, 2, 7, 14 Factors of 17: 1, 17 GCF (14, 17) = 1
17 and 1
187
119
The common factors of 13 and 39 are: 1 and 13
The factors of 13 are 1, 13 The factors of 26 are 1, 2, 13, 26 The common factors of 13 and 26 are 1 and 13. The common factors are: 1, 13
255
680
The GCF is 1.
Since 13 is a factor of 39, all of its factors are common.