The book is now available! 17
(just those submitted by Delph)
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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 'Delph': (Click here to show all)

Prime Numbers CD Image J. Neptune © 1994
+ There are 17 capital letters in the English alphabet without horizontal symmetry. Can you find them all? [Delph]

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