The book is now available! 11112...21111 (41-digits)
(another Prime Pages' Curiosity)
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

                               1 1112233444 5566777889 8877766554 4433221111
+ A palindromic prime formed from the first digits of all two-digit primes in forward and reverse concatenation. [Silva]

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