Ultramagic squares

A magic square is said to be an ultramagic square, if it has the following properties:

• it is a pandiagonal magic square.
• it is a self-complement magic square.

Let us take a look at the following magic square of order n=5. You can easily see that this square is pandiagonal, as all rows, columns and diagonals sum to S=65.

Now we transform this magic square into its complement and we can see that a rotation with an angle of 180° will produce the original square again. So it is selfcomplement and hence ultramagic.