what are co-prime numbers?
A set of numbers which do not have any other common factor except 1 are called as co-prime numbers.
For example:- 2 and 3 are co prime numbers as they only have 1 as common factor between them. Some other examples of co-prime numbers are 4 and 5, 6 and 7, 8 and 9 etc.
1 is co-prime with all other numbers. All prime numbers are co-prime to each other.