Fill a Column with a Series of Numbers in Excel

Select the first cell in the range that you want to fill.
Type the starting value for the series.
Type a value in the next cell to establish a pattern.

Tip: For example, if you want the series 1, 2, 3, 4, 5…, type 1 and 2 in the first two cells. If you want the series 2, 4, 6, 8…, type 2 and 4.
Select the cells that contain the starting values.

Note: In Excel 2013 and later, the Quick Analysis button is displayed by default when you select more than one cell containing data. You can ignore the button to complete this procedure.
Drag the fill handle across the range that you want to fill.

Note: As you drag the fill handle across each cell, Excel displays a preview of the value. If you want a different pattern, drag the fill handle by holding down the right-click button, and then choose a pattern.

To fill in increasing order, drag down or to the right. To fill in decreasing order, drag up or to the left.