ANSWERS: 3
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Yes unambiguous 9 x 9 sudoku puzzles can be made with 17 given numbers.
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Here you can download a collection of 47793 distinct Su-doku configurations with 17 entries. http://people.csse.uwa.edu.au/gordon/sudoku17 The following link that contains a proof that at least 17 givens are necessary. http://www3.sympatico.ca/georg.josephs/SudokuEigenfunctionCalculation.htm
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Here a sudoku with 21 givens. (click image)
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