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Fitting

In the Dewey decimal system, books on number theory are labeled 512.81.

512 = 29 and 81 = 92.

February 19, 2010February 18, 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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