In number theory, sexy primes are prime numbers that differ from each other by 6.
For example, the numbers 5 and 11 are a pair of sexy primes, because both are prime and
The term "sexy prime" is a pun stemming from the Latin word for six: sex.
In August 2014, the Polymath group, seeking the proof of the twin prime conjecture, showed that if the generalized Elliott–Halberstam conjecture is proven, one can show the existence of infinitely many pairs of consecutive primes that differ by at most 6 and as such they are either twin, cousin or sexy primes.
[1] The sexy primes (sequences OEIS: A023201 and OEIS: A046117 in OEIS) below 500 are: