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#2**0 **

If I had to take a guess, I would say that one of the millennium prize problems set by the Clay Mathematics Institute at the beginning of the millennium. Only one has been solved thus far.

Out of those, the easiest to understand is P versus NP.

Click here to redirect yourself to the corresponding wikipedia page.

TheXSquaredFactor Sep 2, 2017

#6**0 **

Let a and b be positive integers such that ab + 1 divides a2 + b2. Show that (a2 + b2 / ab + 1) is the square of an integer.

RedGlasses Sep 5, 2017