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1, 3, 9, 11, 33, 99, 101, 303, 909, 1111, 3333 and 9999.
$9999
9999 is the largest 4-digit number.When added with 1 it becomes 10000. 9999 + 1 = 10000.
9000 of them. All of the numbers 1 thru 9999 EXCEPT 1 thru 999. 9999 - 999 = 9000.
1 1630/9999