113227domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form (p^2+2)/33 (with p prime).at n=22A165673Primes which are the concatenation of a Sophie Germain prime p and 2p+1.at n=3A168165Primes which are the concatenation of a prime p and 2p+1.at n=9A168166Primes formed by concatenating k and 2k+1.at n=40A309808Prime numbersat n=10732