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It's not a Magic Square (Posted on 2019-10-17) Difficulty: 4 of 5
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.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Solutioncomputer solutionCharlie2019-10-17 13:53:36
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