28132417domain: NPropertiesPrimalityPrimeyesAppears in sequencesHonaker primes of the form k^2 + 1.at n=19A176790Primes p of the form 4m^2+1 such that q=4p^2+1 and r=4q^2+1 are prime.at n=2A248887Prime numbersat n=1749151