83299domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = 68*n^2 - 1.at n=34A158730Primes p such that 2p^2-1, 3p^2-2 and 4p^2-3 are also prime.at n=27A213079Primes p such that q = p^2 - 2, r = q^2 - 2 and s = r^2 - 2 are also prime.at n=10A257552Prime numbersat n=8133