11110...01111 (121-digits)

This number is a prime.

                    1 1110110011 1111000111 1110000000 0001100002 0000110022
2200110027 2001100222 2001100002 0000110000 0000001111 1100011111 1001101111

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

                  1
                 1 1
                1 0 1
               1 0 0 1
      1 1 1 1 1 0 0 0 1 1 1 1 1
       1 0 0 0 0 0 0 0 0 0 0 1
        1 0 0 0 0 2 0 0 0 0 1
         1 0 0 2 2 2 2 0 0 1
          1 0 0 2 7 2 0 0 1
         1 0 0 2 2 2 2 0 0 1
        1 0 0 0 0 2 0 0 0 0 1
       1 0 0 0 0 0 0 0 0 0 0 1
      1 1 1 1 1 0 0 0 1 1 1 1 1
               1 0 0 1
                1 0 1
                 1 1
                  1