Using AutoFill, how to you create a list of numbers 1 through 20? Using AutoFill, how to you create a list of numbers 1 through 20? AutoFill does not recognize a single list of numbers as a series. Type 1 in first cell then drag the AutoFill handle down until it reaches 20. Type 1 in the first cell, type 2 in the cell below, select both cells, and drag the AutoFill handle down until it reaches 20.