none
123456.
1023456789
1234567
5
none
102
123456.
1023456789
1234567
102345
5
Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.
5
0123456789
10234567
0132 or 1234 0123 or without 0 at front = 1023