Uncommon
Sexy primes
Prime numbers which differ by 6
Sexy primes
In number theory, sexy primes are prime numbers that differ from another prime by 6. For example, the numbers 5 and 11 are a pair of sexy primes, because both are prime and 11 − 5 = 6 {\textstyle 11-5=6} . The term "sexy prime" is a pun stemming from the Latin word for six: sex. If p + 2 or p + 4 (where p is the lower prime) is also prime, then the sexy prime is part of a prime triplet.
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