Question: what are coprime and twin prime numbers?
Answer: Co prime: Two integers a and b are said to be relatively co-prime if their greatest common divisor is equal to one. For example 14 and 15 are co-prime as their GCD=1 but 14 and 21 are not co-prime as their GCD=7. Twin prime: A twin prime is a prime number that has a prime gap of two.