3 x 17
1 x 51
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No, 51 isn't prime. 17 is the largest prime factor of 306.
Since 17 is a factor of 51, it is automatically the GCF.
What is the greatest common factor shared by 51 and 21?
1 x 2601, 3 x 867, 9 x 289, 17 x 153, 51 x 51 = 2,601
The GCF of 6 and 51 is 3. The prime factorization of 6 is 2*3 The prime factorization of 51 is 3*17 So the GCF is 3.