VBA Increasing formula by 1 each time it is added

[silentcarl]

I am trying to use a macro to place this formula in cells B3, B9, B(n+6)... until the last row while having the cell references as I need them:

=CONCATENATE(RawData!A2," ",RawData!B2)

So far I have:

Sub test()
Dim UsedRows As Integer

UsedRows = Worksheets("RawData").UsedRange.Rows.Count

Dim i As Long
For i = 3 To UsedRows Step 6

With Cells(i, 2)

.Formula = "=CONCATENATE(RawData!A" & i & "," & " " & ",RawData!B" & i & ")"


    End With
    
Next i

End Sub

This copies down every 6 rows as I want, but the cell references are the same as the row number. ie A3,A9,A15...

I want them to be sequential ( A2,A3,A4,A5,etc.)

 

[silentcarl]

.Formula = "=CONCATENATE(RawData!A" & 1 + (i + 3) / 6 & "," & " " & ",RawData!B" & 1 + (i + 3) / 6 & ")"

^this works for what I'm trying to do.