In mathematics, two integers a and b are cousins Yes ( or coprime numbers, or cousins related ) if, by definition, do not have any factor cousin in common, or, in other words, if you don't have another common divisor rather than 1 and - 1. Equivalently are cousins, if and only if their greatest common divisor is equal to 1. example, 6 and 35 are cousins together, but 6 and 27 are not because they are both divisible by 3. 1 is cousin to all integers, while 0 is only about 1 and - 1.Un medium fast to determine whether two integers are cousins together is Euclid's algorithm.