Sub NumVis()
Dim myCell As Range, x As Long
x = 1
Application.ScreenUpdating = False
For Each myCell In Range("A2:A" & Range("A" & Rows.Count).End(xlUp).Row).SpecialCells(12)
myCell.Offset(, 1).Value = x
x = x + 1
Next
Application.ScreenUpdating = True
End Sub