10110...11111 (103-digits)

This number is a prime.

                                        101 1011101111 0111110111 1110111111
1011111111 0111111111 0111111111 1011111111 1110111111 1111110111 1111111111

One followed by zero, followed by 2 ones, followed by another zero, followed by three ones and so on, finaly ending with 13 ones. It is the smallest anti-Yarborough prime number of this type. [Petrov]