1297061domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p with pi(p), pi(2*p), pi(3*p) and pi(4*p) all prime, where pi(x) denotes the number of primes not exceeding x.at n=5A240604Number of irredundant sets in the n-antiprism graph.at n=15A290510Prime numbersat n=99817