207953domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 4 iterations of function f(x) = 5x + 4.at n=25A023314Primes of the form k^2 + 17.at n=24A228244Number of compositions of the n-th prime into a prime number of prime parts.at n=11A344782Prime numbersat n=18630