5 - 3 = 2
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Twin primes are pairs of prime numbers that differ from each other by two. 29 and 31 are twin primes.
They are called twin primes and there are thought to be infinitely many such pairs.
No, twin primes are pairs of prime numbers that have only one number between them which is a composite number. For example, (3, 5) and (11, 13) are twin prime pairs with the composite number 4 and 12 respectively between them.
No, 21 and 23 are not twin prime numbers. Twin primes are pairs of prime numbers that differ by 2, such as 3 and 5, or 11 and 13.
twin primes