1111118111111

This number is a prime.

                                                              111 1118111111

+ 


     1
  1 1 1 1
   1 8 1
  1 1 1 1
     1
The smallest star-congruent prime of order 2. [Hartley]

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