666666666

This number is a composite.

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

The only nine-digit repdigit such that the difference of all truncations of itself from itself plus one, i.e., 666666666-66666666-6666666-666666-66666-6666-666-66-6 + 1 = 592592599, is prime. [Bajpai]