copy unique value from column to another column

Hi All,

Probably a very easy question, but couldn't find a thread similar to this.

In column A I have weeknumbers (duplicates occur). In column C I want all unique weeknumbers from column A.
Data in column A starts at cell A6, the blanks are not to be copied. Pasting in cell C2 downward. Column C then to be sorted smallest to largest.

See attached file with the example data.

What will need to be the VBA code to obtain the above?

Thanks all for your input!
Peter