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 <t5k.org> © G. L. Honaker and Reginald McLean