The smartest people in the world can't crack them. Maybe you'll have better luck.
For all of the recent strides we've made in the math world—like a supercomputer finally solving the Sum of Three Cubes problem that puzzled mathematicians for 65 years—we're forever crunching calculations in pursuit of deeper numerical knowledge. Some math problems have been challenging us for centuries, and while brain-busters like these hardest math problems that follow may seem impossible, someone is bound to solve 'em eventually. Maybe.
For now, you can take a crack at the hardest math problems known to man, woman, and machine.
Source: Popular Mechanics