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- One of the most ancient of mathematical curiosities is the so-called magic square.
- Benjamin can also handle magic squares, natural logarithms, cube roots, and much more.
- It contains the first magic square to be seen in Europe, cleverly including the date 1514 as two entries in the middle of the bottom row.
- In 1972, Richard Schroeppel proved that, if a perfect magic square of order 5 exists, its center number must be 63.
- His version of magic square - a variant now termed the Franklin magic square - was inspired by the work of Stifel and Frénicle, both of whose magic squares were of a more traditional variety.