1, 3, and 5.
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In base 10, all numbers whose last digit is a 5 or a 0
They belong to a set of numbers whose first digit is 8. There are 720 such numbers and I regret that I do not have the patience to list them all.
11, 19, 41, 61, and 89
3 digit numbers are lessthan 4 digit numbers
There is no such ratio that applies for all single-digit and double-digit integers.