The book is now available! 13
(just those submitted by McCarthy)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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Photo credit: Patrick Kik
+ A female Virginia opossum usually has 13 nipples: twelve efficiently arranged in an open circle with one in the center. The length of gestation for this curious marsupial is about 13 days. [McCarthy]

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