0 123 456
OR if you don't want to count the zero:
1 234 567
1,234,567
none
1023456789
123456.
1234567
1,234,567
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