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Math Notes

1 + 4 + 5 + 8 = 18
18 × 81 = 1458

1 + 7 + 2 + 9 = 19
19 × 91 = 1729

May 21, 2007May 19, 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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