Well, darling, the co-prime numbers between 15 and 30 are 1 and 7. Co-prime means they only have 1 as their common factor, so anything else is just extra baggage. So, in this case, 1 and 7 are the lucky winners of the co-prime club between 15 and 30.
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15 and 37 are co-prime because they have no common factor greater than 1.
Any integer greater than one can be co-prime.
All numbers greater than one in that range can be co-prime. 4 and 9 are co-prime.
Any number greater than one can be co-prime.
No. 15 and 5 share the factor 5.