The book is now available! 33373...37333 (49-digits)
(another Prime Pages' Curiosity)
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                       333733333 3733333373 3377777773 3373333337 3333337333
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      3 3 3 7 3 3 3
      3 3 3 7 3 3 3
      3 3 3 7 3 3 3
      7 7 7 7 7 7 7
      3 3 3 7 3 3 3
      3 3 3 7 3 3 3
      3 3 3 7 3 3 3 
The only plus sign prime of order 7. [Loungrides]




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