40735domain: NAppears in sequencesNumbers k such that 3k-4, 3k-2, 3k+2, and 3k+4 are primes.at n=42A173092Number of (3+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=28A258556