Word: duner
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...Leach 1G. spoke on "Magic Squares." Little literature, he said, has been published on the subject. The best work, perhaps, appeared in France in the early part of the last century. "Mathematical Recreations," by Ball, contains a very interesting chapter on magic squares. An engraving of Albert Duner's, executed about 1500, shows a remarkable square of the fourth order. This square has four cells or checkerboard squares on a side. Any column or diagonal adds up to 34. There are more than 500,000 different magic squares of the fifth order...
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