Panmagic square

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A panmagic square of order n is a magic square with the additional requirement that not only the n rows and the n columns, but also the 2n broken diagonals sum to the same magic constant.

3 10 15 6
13 8 1 12
2 11 14 7
16 5 4 9

The magic constant of this panmagic square is 34. The broken diagonals (such as 10+1+7+16 and 10+13+7+4) all sum correctly.

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fr:Carré panmagique
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