A twin prime is a prime number that is either 2 less or 2 more than another prime number-for example, the twin prime pair (41, 43).
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They are called twin primes. There are infinitely many of them; the first pair is 3 and 5.
Twin primes
2 and 3 are the first two prime numbers. The difference between them is 1
2 and 5 the difference is 3 which is a prime number
Any prime numbers greater than 2 will be odd numbers. The difference between two odd numbers will be an even number. So, the difference between two prime (and odd) numbers could be 2, 4, or 6, of the numbers given. The difference could not be 3, 5, or 7.
2 and 5 are one such pair.