Fermat's Last Theorem has been known to be one of the most difficult mathematical problems in the Guinness Book of World Records. It stated that no three positive integers (a, b, and c) can satisfy the equation an +bn = cn for any integer of n greater than two. Eventually, in 1994, a successful proof was submitted by Andrew Wiles after 358 years of effort by mathematicians.
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This one. The problem is trying to prove that a infinite number of pairs of prime numbers exist. It has recently been proved as shown by this article on nature.com. This is one of the oldest math problems in history, going clear back to the ancient Greeks.
n+1=n solve for n.
Different people find different things hard. So a problem that is hard for someone may seem easy to you and one that you think is hard may be easy for someone else. It is, therefore, not possible to answer the question.
What is hard for some people may not be hard for others. So there is really no answer to this question.
Different people find different problems hard and so it is difficult to answer the question.