what is prime and co-prime number
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In number theory, two integers a and b are said to be relatively prime, mutually prime, or coprime (also written co-prime) if the only positive integer (factor) that divides both of them is 1. Consequently, any prime number that divides one of a or b does not divide the other.
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A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.
Two integars are said to be coprime if the common number that divides both (common factor) is 1 only. Some of examples are 3 and 7, 8 and 13. 16 and 14 are not coprime numbers because 2 is also common factore here.
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