What is the Greatest Common Factor of 1305 and 1317?

Greatest common factor (GCF) of 1305 and 1317 is 3.

GCF(1305,1317) = 3

We will now calculate the prime factors of 1305 and 1317, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1305 and 1317.

How to find the GCF of 1305 and 1317?

We will first find the prime factorization of 1305 and 1317. After we will calculate the factors of 1305 and 1317 and find the biggest common factor number .

Step-1: Prime Factorization of 1305

Prime factors of 1305 are 3, 5, 29. Prime factorization of 1305 in exponential form is:

1305 = 3² × 5¹ × 29¹

Step-2: Prime Factorization of 1317

Prime factors of 1317 are 3, 439. Prime factorization of 1317 in exponential form is:

1317 = 3¹ × 439¹

Step-3: Factors of 1305

List of positive integer factors of 1305 that divides 1305 without a remainder.

1, 3, 5, 9, 15, 29, 45, 87, 145, 261, 435

Step-4: Factors of 1317

List of positive integer factors of 1317 that divides 1305 without a remainder.

1, 3, 439

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1305 and 1317. The biggest common factor number is the GCF number.
So the greatest common factor 1305 and 1317 is 3.

Also check out the Least Common Multiple of 1305 and 1317