In number theory, notation (a, b) represents the greatest common divisor of an integer A and an integer B (also translated as the greatest common divisor), that is, the largest integer that can be divisible by both A and B at the same time. For example, there are four positive integers * * * that can be divided by 18 and 24: 1, 2,3,6 at the same time, of which 6 is the largest, so (18,24) = 6.

(a, b) = 1, that is, the greatest common factor of A and B is 1 (all positive integers greater than 1 cannot divide A and B at the same time), which means that A and B are prime numbers.

The greatest common divisor of a and b is 1.

(a, b)= 1 indicates that A and B are coprime; (a, b)|c means that (a, b) is divisible by c, where (a, b) means the greatest common divisor of a and b.

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