11111...11111 (100-digits)

This number is a prime.

                                            1111111111 1111112111 1111111111
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

Just showing those entries submitted by 'Gupta': (Click here to show all)

The largest near-repunit prime less than a googol. [Gupta]