6519613domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 5 iterations of the function f(x) = 10x + 3.at n=26A023356Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11100-00100-00111 pattern in any orientation.at n=14A147254Prime numbersat n=446019