33333...33333 (441-digits)

This number is a prime.

+ 

   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3 
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3 
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
   3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 3 3 3 3 3
The only plus sign prime of order 21. Note that it is also a prime-digit prime. [Loungrides]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell