222335
1023456789
There are only two smaller 3-digit numbers and both of them have repeated digits.
102
103
It is 120 if the digits cannot be repeated.
1000000000 or, if negative numbers are permitted, then -9999999999
1023456789
The smallest number with no digits repeated would either be zero or one, depending on the set of numbers you want to choose from.
10234567
There are only two smaller 3-digit numbers and both of them have repeated digits.
100 unless negative numbers are permitted: in which case, the answer is -999
0123456789
10234567
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.
102
100,000,000,000
103