# Greatest Common Divisor (GCD) of 2 and 17

In this article we will calculate and work out the Greatest Common Divisor (GCD) of the numbers 2 and 17.

The GCD of 2 and 17 is the largest positive integer (a whole number with no decimal) that can be divided evenly into all of the numbers in the set.

You might have seen this called the Greatest Common Factor (GCF) or the Highest Common Factor (HCF). They all mean the same thing.

If you are calculating the Greatest Common Divisor of 2 and 17 yourself, the easiest way to do that might be to actually list out all of the divisors for each number and then find out what the greatest common divisor is.

For 2 and 17 those divisors look like this:

- Divisors for 2:
**1**and 2 - Divisors for 17:
**1**and 17

As you can see when you list out the divisors of each number, 1 is the greatest number that 2 and 17 divides into.

When working with larger numbers, though, listing through all of the divisors will take a lot of computer processing power.

When working with larger numbers, or even with smaller numbers when you want to find the Greatest Common Divisor of 2 and 17 in the most efficient way possible, we would use Prime Factors.

A Prime Number is one that is divisible only by itself and the number 1. And so a Prime Factor is a Prime Number which is also a Factor of 2 and 17.

The algorithm I use for this is much more efficient because there are far less Prime Factors in 2 and 17.

For 2 and 17 the Prime Factors are:

- Prime Factors for 2: 2
- Prime Factors for 17: 17

You can see again from the bolded number 1 that the Greatest Common Divisor of 2 and 17 is 1.

GCD(2,17) = 1

Hopefully I have been able to explain the GCD of 2 and 17 and given you some information that you can use to try this for yourself and calculate the Greatest Common Divisor of a new set of numbers.

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