6635777domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p of the form 4*n^2 + 1 such that 4*p^2+1 is also prime.at n=30A121834Primes p of the form 4m^2+1 such that q=4p^2+1 and r=4q^2+1 are prime.at n=1A248887Prime numbersat n=453436