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Sacred Number

Gregor Reischs sixteenthcentury engraving showing Pythagoras using a medieval counting board to form the numbers 1,241 and 82 right while Boethius calculates using the Indian numerals we are familiar with today left. In the center is Arithmetic, with the two geometric progressions 1,2,4,8, and 1,3,9,27 appearing on her dress.
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