449473domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-1000 pattern in any orientation.at n=18A146646Primes p followed by a gap of 70 = nextprime(p) - p.at n=8A204792Prime numbersat n=37668