5500247domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+2) X 3 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly one way, and new values 0..1 introduced in row major order.at n=11A204485Prime numbersat n=380814