281563domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes which are the concatenation of a Sophie Germain prime p and 2p+1.at n=5A168165Primes which are the concatenation of a prime p and 2p+1.at n=17A168166Index position of {2}^n within the list of partitions of 2n in canonical ordering.at n=26A332706Prime numbersat n=24562