Any number that is is a palindrome will always be a palindrome.
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9999 is the 4-digit number and 999 is the 3-digit number.
The lowest positive 4-digit number is 1000
The largest 4 digit number in base 8 is 77778 (= 409510).
4082 Since the tens digit is 2 times the thousand digit, it must be an even digit. So it can be 8, 6, 4, or 2. But, the thousands digit is 4 greater than the hundred digit. So that the hundred digit must be 0, the thousands digit must be 4, the hundreds digit must be 8, and the ones digit must be 2.
8888