16666...99991 (100-digits)

This number is a prime.

                                            1666666666 6666666666 6666666666
6666666666 6666666666 9999999999 9999999999 9999999999 9999999999 9999999991

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

This is a strobogrammatic prime of perfect square length. [Patterson]