211254469domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 5 6 or 8 and every 3X3 column and antidiagonal sum not equal to 0 3 5 6 or 8.at n=19A252616Prime numbersat n=11666930