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Math
The Goldbach Conjecture Is A Simple Problem That's Never Been Solved
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A 275Year Old Dilemma
Why Hasn't It Been Solved?
Watch And Learn: Our Favorite Videos About Math
The Collatz Conjecture
Try your hand at another very tricky problem.
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The Simplest Impossible Problem
This one takes simple arithmetic—but that's where the simplicity ends.
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Key Facts In This Video

There don't seem to be any clear patterns in the sequences generated by the simplest impossible problem. 01:19

To date, all numbers up to 5 x 2^60 have been tested with the 3x+1 problem. 02:00

Speaking about the 3x+1 problem, famous mathematician Paul Erdős said, "Mathematics is not yet ready for such problems." 03:23
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