123855domain: NAppears in sequencesNumbers k such that 2k+1, 4k+1, 6k+1, 8k+1 and 10k+1 are primes.at n=9A124410Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=13A253838