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Double Duty

multi-magic square

A “multi-magic” square: Each row and column sums to 260; square each term and they sum to 11,180.

June 10, 2008September 25, 2010 | Science & Math

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Futility Closet is a collection of entertaining curiosities in history, literature, language, art, philosophy, and mathematics, designed to help you waste time as enjoyably as possible.

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