In how many distinct ways can I fill a 3×3 grid with the integers 1 through 9 (each occurring exactly once) such that all cells in the grid are coprime with the neighbors? (Note that rotations and reflections count as distinct ways of filling the grid)

Note: A cell's neighbors are the cells that share a full side with it. If two cells share a corner but not a side, they are not neighbors.

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Posted by van thao on 2019-12-16 01:12:41