150961domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of ways to place zero or more nonadjacent (0,0) (1,0) (1,1) (2,0) (3,1) (4,0) (4,1) (5,1) polyhexes in any orientation on a planar n X n X n triangular grid.at n=8A155367Primes of form n^2 + 6561.at n=34A256837Prime numbersat n=13929