249499domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form p^2 + p - 1 when p is prime.at n=35A053185Number of ways to reciprocally link elements of an n X 5 array either to themselves or to exactly two horizontal and vertical neighbors, without consecutive collinear links.at n=9A220611Prime numbersat n=22004