11111...11111 (121-digits)
This number is a prime.
1 1111111111 1111111111 1111111111 1111111111 1111111777
1111111175 7111111117 7711111111 1111111111 1111111111 1111111111 1111111111
The smallest zero-free square-congruent prime of order 11. [Patterson]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell