Two (or more) numbers are said to be co-prime if they have no prime factor in common. The numbers, themselves need not be prime.
Thus,
14 (= 2*7) and 15 (= 3*5) are co-prime.
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2 is the smallest prime number. It is co-prime with every odd number.
No multiples of the same number greater than one can be co-prime, since they will both have that number as a factor.
Two number are co-prime if there is no whole number other than 1 that divides them both exactly
Any number from 2-200 can be co-prime.
Any number greater than 1 can be co-prime.