3 ms·

If you don't care about computation time, then why stop there? You can encode the Mth Mersenne with the integer M.

• hinkley 11y ago
  But then I have to keep patching the code every time a new one comes out. Too hard!
  • spacehome 11y ago
    You don't. You can write a program that converts between m and M_m. It just takes a long time to convert.