If I try to calculate large exponents in LibreOffice Calc or OpenOffice.org Calc, the results come out to be erroneous. See these two examples where I calculate 13^18,

**Using LibreOffice Calc**

**Using OpenOffice.org Calc**

The result is erroneous in both the cases, as we can find using Calculator (gcalctool).

All the above tests were done in Ubuntu. I can not comment on Excel in MS Office since I do not have access to it.

Now, using a calculator will be possible, but cumbersome. I need to fill up a table with more than five hundred values. I know that I can resort to Euler's theorem or Fermat's little theorem or corollaries of these, but actually I am going to use the aforementioned table to show numerical validity (and use) of these theorems.

Is there a way to coax the spreadsheet programs to give me correct results?