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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.
No - co-prime numbers are pairs of numbers which share no positive integer factors apart from 1. Twin prime numbers are a pair of prime numbers with a difference of 2.
No.
It's an enormous list; we wouldn't be able to get them all. All of the prime numbers in that range are co-prime with each other. The composite numbers, as long as they aren't multiples of the primes, are co-prime with the primes. The square numbers are co-prime with each other and quite a few of the composite numbers are co-prime with each other. If you could narrow the range, we could be more specific.
Co-prime numbers, like 4 and 9, are any set of integers that have a GCF of 1.