73394261domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+2)X3 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..1 introduced in row major order.at n=10A206652Prime numbersat n=4305811