The book is now available! 73
(just those submitted by Robinette)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

Just showing those entries submitted by 'Robinette': (Click here to show all)

+ The clepsydra (an ancient device that measured time by marking the regulated flow of water through a small opening) had a wheel with 73 teeth. [Robinette]

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