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A prime number is co-prime with any other number that is not its multiple.Ĭuemath is one of the world's leading math learning platforms that offers LIVE 1-to-1 online math classes for grades K-12. 1 forms a co-prime pair with any other number. Any two consecutive numbers are always co-prime. Any two prime numbers are always co-prime. For example, 12 and 35 are co-prime numbers, although, 12 and 35 are NOT prime numbers. 
Co-prime numbers need not necessarily be prime numbers.It can also be said that if the GCF of any two numbers is 1, those are co-prime numbers.
Two numbers are co-prime if their GCF is 1. Here is Cuemath's online co-prime calculator for our ease. Try out forming more such pairs of co-prime numbers by yourself. In the list of co-prime numbers from 1 to 100, there are many pairs that can be listed as co-prime numbers based on the above properties. There are multiple such combinations where 1 is the only common factor. Any two consecutive numbers have 1 as their common factor.Ĭonsider a few pairs of such numbers. All pairs of two consecutive numbers are co-prime numbers. For example, 2 and 3, 5 and 7, 11 and 13, and so on. We can check any two prime numbers and get them as co-prime. Two prime numbers are always co-prime. 
For example, 5 and 9 are co-prime numbers. The sum of two co-prime numbers is always co-prime with their product.Two even numbers cannot be co-prime numbers as they always have 2 as the common factor.1 forms a co-prime number pair with every number.
The Least Common Multiple (LCM) of two co-primes is always their product.For example, 5 and 9 are coprime numbers, there, HCF (5, 9) = 1. The Highest Common Factor (HCF) of two coprime numbers is always 1.Co-prime numbers can be identified easily with the help of some properties that are explained below:
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