33373...37333 (49-digits)

This number is a prime.

                       333733333 3733333373 3377777773 3373333337 3333337333

+ 

      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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