3196951domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+2)X4 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly one way, and new values 0..1 introduced in row major order.at n=9A204355Prime numbersat n=230002