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Wolfram Alpha needs to update: http://www.wolframalpha.com/input/?i=what+is+the+largest+mersenne+prime+number%3F http://www.wolframalpha.com/input/?i=what+is+th

• jrajav 14y ago
  Well it's not up to date, but it's not wrong either. It says "Largest known ... as of July 2012"