Now that Fermat's Last Theorem has been proven, the Collatz conjecture is the simplest unsolved math problem. That is what makes it special. There are other uns

Now that Fermat's Last Theorem has been proven, the Collatz conjecture is the simplest unsolved math problem. That is what makes it special. There are other unsolved problems that are at the heart of some rich field of mathematics and would be more mathematically significant to solve, like the Riemann hypothesis.