UNCRACKABLE? The Collatz Conjecture - Numberphile
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Collatz Conjecture (extra footage) - Numberphile
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Goldbach Conjecture - Numberphile
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Math News: The Fish Bone Conjecture has been deboned!!
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The Simplest Math Problem No One Can Solve - Collatz Conjecture
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Why do calculators get this wrong? (We don't know!)
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Catalan's Conjecture - Numberphile
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Does -1/12 Protect Us From Infinity? - Numberphile
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