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]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell