![]() This gives us now the definition of Co-prime numbers. But now, we are going to talk about pairs of numbers that must have a “common primary” factor of 1. ![]() ![]() Using the definition of Prime Numbers, we notice that each number must have 1 as its “primary” factor. For this reason, we can expect that Co-prime numbers are pairs of positive numbers with unique properties, properties that we will see later. On the other hand, negative 2 is not a prime number, because it can also have -1 and 2 as factors. Now, let us list the factors of each number.īy looking at the factor tree and the listed form of the factors above, we can easily conclude that positive 2 is a prime number because it has only two factors, which are 1 and itself. Let’s take a look at the illustration below to see the difference. ![]() And yes, we do not consider the negative integers because they have more than two factors. This means if a number has more than two factors, it is not prime but rather a composite number. Before we dive into the actual definition of Co- prime Numbers, let’s have a recap first of what a Prime Number is.Ī prime number is a positive integer or number that has factors of 1 and the number itself.
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