31336843domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+2) X (1+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.at n=25A252516Prime numbersat n=1935455