Because the definition of twin primes is: two prime numbers with a difference of
2.
3 and 5 are both prime numbers, and their difference is 5 - 3 = 2 → they are twin primes.
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twin primes are 2 prime numbers with a difference of 2 the prime numbers 5 and 3 are twin primes because 5 minus 3 equals 2 so 109 and 111 are not twin primes
A twin prime pair are two primes separated by 2. For example, 3 and 5 are twin primes. It is conjectured that there are an infinite number of twin primes.
Well, to begin with, 2 and 3 are not twin primes. The first twin primes are 3 and 5, but then 5 and 7 are also twin primes. After that, it's 11 and 13, then 17 and 19, 29 and 31, and 41 and 43. Twin primes are distinguished by having a difference of 2 between them.
They are called twin primes. 3 & 5 are twin primes.
Prime numbers that differ from each other by exactly 2 are twin primes. Examples of twin primes are 3 and 5, 17 and 19, 599 and 601.