The book is now available! 33333...33333 (81-digits)
(another Prime Pages' Curiosity)
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                                                                3 3333333332
2222223325 5555233257 7752332577 7523325777 5233255555 2332222222 3333333333
+

      3 3 3 3 3 3 3 3 3
      3 2 2 2 2 2 2 2 3
      3 2 5 5 5 5 5 2 3
      3 2 5 7 7 7 5 2 3
      3 2 5 7 7 7 5 2 3
      3 2 5 7 7 7 5 2 3
      3 2 5 5 5 5 5 2 3
      3 2 2 2 2 2 2 2 3
      3 3 3 3 3 3 3 3 3

The smallest square-congruent prime of order 9 containing all four prime digits. [Rupinski]




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