What is twin prime number?

A twin prime number refers to a pair of prime numbers that differ by exactly 2. In other words, when two prime numbers have a gap of only two numbers between them, they are called twin primes.

Examples:

• (3, 5)

• (5, 7)

• (11, 13)

• (17, 19)

Both numbers in a twin prime pair are prime because they have only two factors: 1 and themselves. Twin primes are an important concept in number theory and mathematics.