Make it fifteen: Answer
8 1 6
3 5 7
4 9 2
This can of course be rotated and mirrored at will.
Heluk Tekbulut:
The answer for 5x5 (numbers 1-5²):
3 16 9 22 15
20 8 21 14 2
7 25 13 1 19
24 12 5 18 6
11 4 17 10 23
For any m x m matrix with numbers 1 to m² where m is odd
there is a solution and the sum is m²*(m²+1)/(2*m).
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