This number is a prime.
111 1111111111 1111111117
This near-repunit prime can be written as R23+6, where R stands for the nth repunit. It and R23 are in fact the largest known cases of a single group of ten numbers from (1)w0 to (1)w9 containing more than one prime.
The smallest near-repunit prime containing p times the smallest repunit prime p. [Beedassy]