511061domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form (4*k + 1)^2 + (4*k + 2)^2 where k=0,1,2,3,...at n=30A087871Primes p such that 2p-1 is a square and 2p+1 is also prime.at n=19A386995Prime numbersat n=42370