text: Actually, Fermat's last Theorem has been proved in 1993 by a mathematician named Andrew Wiles.\n\nAs far as the question goes, it ain't a theorem if it hasn't been proved ;)\n\nBut my favorite conjecture is Goldbach's conjecture, which states that any even number over 2 can be written as a sum of two primes (14 = 3 + 11, for example). No one's found a counterexample, but no one's proved it either.