181183domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are concatenations of n with n + 2.at n=19A032625Terms k of A002977 such that both (k-1)/2 and (k-1)/3 are also terms of A002977.at n=31A085249Primes formed from the concatenation of previousprime(n) and n.at n=16A280576Prime numbersat n=16426