How about 256
102 is the smallest three digit number with different digits.
The greatest 9-digit number using three different digits is 999888777, formed by using the digits 9, 8, and 7 in descending order. The smallest 9-digit number using three different digits is 100000000, created with the digits 1, 0, and 0. This arrangement ensures that the number starts with 1, followed by the zeros to maintain the smallest value.
000
smallest 8 digit number with three different digits
638
102
102
10002
100,002.
All five digit numbers have three digits. The smallest five digit whole number is 10,000
The smallest three-digit number is 100. It is the first number that has three digits, as it is the smallest integer that is equal to or greater than 100. In the decimal number system, three-digit numbers range from 100 to 999.
There are only two smaller 3-digit numbers and both of them have repeated digits.