There are infinitely many.
For example,
14,104,1004,10004,100004 etc.
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There are no 3-digit whole numbers whose digits sum to 3. The smallest 3-digit number is 100, and the largest is 999, but in neither case is the sum of the digits equal to 3.
8,9,10,11,12
They are five and three.
The numbers are 17, 18, 19, 20 and 21.
999 are whole.