895003domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 8x + 9.at n=19A023323Number of -n..n arrays of 5 elements with first through fourth differences also in -n..n.at n=12A202665Lower twin prime-indexed primes in the sequence of prime(prime(i)).at n=30A228054Prime numbersat n=70919