2746607domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1)X(4+1) 0..1 arrays with no 2X2 subblock having zero or two 1s.at n=6A251215Number of (n+1)X(7+1) 0..1 arrays with no 2X2 subblock having zero or two 1s.at n=3A251218Prime numbersat n=199770