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Solution to: Digit Square

There are 880 solutions to this problem, if you leave out all rotations and mirror solutions. Here is one of the possible solutions:

811015
131236
111454
27169

This solution is one of the 48 special solutions, for which also the sum of each of the four quadrants, the sum of the middle four numbers, the sum of the four corners, the sum of the corners of the two squares formed by the numbers on the sides, and the sum of the numbers on the opposite sides are 34:

811015
131236
111454
27169
811015
131236
111454
27169
811015
131236
111454
27169
811015
131236
111454
27169
811015
131236
111454
27169

811015
131236
111454
27169
811015
131236
111454
27169
811015
131236
111454
27169
811015
131236
111454
27169
811015
131236
111454
27169


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