How to generate a random number (13 digits) between 9999999999999 - 0000000000001

Hello,
I am trying to generate a random number and I am sucessful doing that:
       Randomize
          strOrderNo = INT((9999999999999 - 0000000000001 + 1) * RND + 0000000000001)

Then update the database with this number plus other options for example depending on what I passed and evently when the click the link I would check the querystring to update the database for each click they do or tell them it is expired:

Function Randomize(Clicks,ExpireDate,ExpireTime)
      Dim sql
      If bGoodToGo = True Then
            sql = "insert into NewTravelRequest" &_
            "(ID,Number,Clicks,ExpireDate,ExpireTime)" &_
              "values(" & ID & ", '" & Number & "', '" & Clicks & "', '" & ExpireDate & "', '" ExpireTime & "')"
      Else
                Do Until bGoodToGo
                Randomize
                strOrderNo = INT((9999999999999 - 0000000000001 + 1) * RND + 0000000000001)
                'strOrderNo = "8888888888888"
           
                bGoodToGo = False
                If Len(strOrderNo) = 13 Then
            ' we have a 13 char string so now test DB that this 13 char Key is unique
                  Response.Write "We have 13 chars<br>" & VBCRLF
                  ' TODO: Do DB test here
                  sql = "SELECT * FROM DownloadID"
                  oRS.Open sql, oConn, 3, 3
                  Do until oRS.EOF
                  strDBNo = Trim(oRS("Number"))
                  Response.Write "Database Numbers: " & strDBNo & "<br>" & VBCRLF
                        If strDBNo <> strOrderNo Then
                                 bGoodToGo = True
                                 Response.Write "Number doesn't exist<br>" & VBCRLF
                         Else
                               ' was already used so
                                bGoodToGo = False
                                Response.Write "Number does exist<br>" & VBCRLF
                                Exit Do
                        End If
                 oRS.MoveNext
                 Loop
                End If    
              loop
        End If
End Function