[gus_massa]

The problem is that the spreadsheets are 2D, so you iterate easily over two variables, the row and the column.

If you need to "program" this in an Excel spreadsheet

  For i = 1 to 5
    For j = 1 to 5
      If 2 * i + j = i * j then
        Print i, j, "*"
      End If
    Next
  Next

You can "write" this in a 6x6 block with the values

    1  2  3  4  5
  1 =If(2*B$1+$A2=B$1*$A2, "*", "")
  2
  3
  4
  5 

And copy the formula from B2 to all the cells, so you get

    1  2  3  4  5
  1 
  2
  3       *
  4    *
  5

[dang]

Ah, that's what I thought you might mean. Can you talk about why you use spreadsheets in the first place, then? You're dealing with nontrivial problems if you hit this limitation, and you could write programs in a general-purpose language if you wanted to. So what do you get from Excel?

(I care about this, btw, because my real job is making a new spreadsheet.)