To extract the first row for each unique number, you can use an Advanced
Filter:

Add a heading row to your list
To create a criteria range:
  Leave cell E1 blank
  In cell E2, type:  =COUNTIF($A$1:A2,A2)=1
Select a cell in the list
Choose Data>Filter>Advanced Filter
Select Copy to Another Location
For the List Range, your list's range should be automatically selected
For the Criteria Range, select E1:E2
For the Copy To range, select cell H1
Click OK