3137357domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that phi(p-2) = phi(p-1).at n=17A256510Primes p such that phi(phi(p-2)-1) = phi(phi(p-1)-1).at n=27A271660Odd primes p such that the area of the triangle with sides p and the next two primes achieves a record for closeness to an integer.at n=13A338269Prime numbersat n=225996