I'm sure I had it written down somewhere (probably shredded it) but didn't include it in my spreadsheet, possible when I allowed myself 5 digits.  Thanks.

But to answer your question re the radical sign.

Heading the text edit box which we use to post comments is a string of format buttons.  The second which bears the images π and Σ offers you a small set of symbols which include both those symbols and the radical, press the button and select the symbol required.

Posted by brianjn on 2011-02-11 04:44:15