The book is now available! 1111111111111111111
(another Prime Pages' Curiosity)
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Participate:
                                                        111111111 1111111111
+ 
      1 1 1
     1 1 1 1
    1 1 1 1 1
     1 1 1 1
      1 1 1

A repunit hex-congruent prime in bases 11 and 12. [Dobb]

+ The second repunit prime. [Gronos]

+ 1111111111111111111^2 = 1111111111111111111 (mod 11111111111111111111111111111111111111). [Luhn]

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