77260domain: NAppears in sequencesNumbers k such that k+1, k+3, k+7 and k+9 are all primes.at n=31A125855Number of ways to place zero or more nonadjacent 1,1 2,1 3,1 4,1 5,1 6,0 6,1 7,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155388