85931domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.at n=15A147326Primes p such that 2p^2-1, 3p^2-2 and 4p^2-3 are also prime.at n=28A213079Prime numbersat n=8359