What is a co-prime number?

Answer 1

Numbers, which do not have any common factor between them other than one, are called co-prime numbers.

When two numbers (they may not be prime) do not have any common factor other than one between them they are called co-prime or relatively prime.

It is obvious that two prime numbers are always co-prime. For example, #17# and #23#.

However, even two composite numbers can also be co-prime or relatively prime. For example #16# and #25# do not have any common factor other than one. Similarly #84# and #65# do not have any common factor and are hence co-prime.

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Answer 2

Luna Angel

A co-prime number, also known as a relatively prime number, is a pair of numbers that have no common factors other than 1. In other words, when two numbers are co-prime, their greatest common divisor (GCD) is 1. For example, 9 and 16 are co-prime because the only positive integer that divides both of them evenly is 1. Co-prime numbers are often used in number theory and cryptography.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.