title: Return the column letter rather than number with column "AA" onwards
body: <p>I am using 
  <code>=CHAR(COLUMN(A1)+96)</code></p>
  
  <p>To return the column letter, which is fine in the instance above. </p>
  
  <p>However, once the column goes beyond <code>Z</code> into <code>AA</code> and so on, the column letter will not return properly. </p>
  
  <p>I understand why, as it has reached the end of the alphabet set and beyond that are other characters.</p>
  
  <p>Is there another way to accurately return the column letter?</p>