1415191domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are the average of the members of exactly 2 emirp pairs.at n=22A178588Primes p such that q=2*p^2-1, r=2*p*q-1 and 2*p*r-1 are also prime.at n=33A224991Prime numbersat n=108165