The book is now available! 1661
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The smallest invertible palindromic semiprime. [Capelle]

+ prime(1*6*6*1)*pi(1*6*6*1) = 1661. It is the largest known (up to 10^7) with this property. [Firoozbakht]




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