17171...55333 (97-digits)

This number is a prime.

                                               1717171 7171717171 7171717171
7171717131 3131313131 3131313131 3131111111 1111111111 1111177777 7755555333

The concatenation of 17 17's followed by 13 13's followed by 11 11's followed by 7 7's followed by 5 5's followed by 3 3's is a prime of prime length and prime digital sum. [Patterson]