88888888888888

This number is a composite.

                                                             8888 8888888888

The only fourteen-digit repdigit such that the difference of all truncations of itself from itself minus one, i.e., 88888888888888–8888888888888–888888888888–88888888888–8888888888–888888888–88888888–8888888–888888–88888–8888–888–88–8-1 = 79012345679023 is prime. [Bajpai]