A nice number theory problem from an Argentinian math olympiad
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FUN Ecuadorian Math Olympiad Number Theory Problem
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A throwback number theory problem
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Deriving the Dirac Equation
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Way beyond the golden ratio: The power of AB=A+B (Mathologer masterclass)
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An awesome number theory contest problem
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Por Que esse Número Está em Todo Canto?
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Perfect Shapes in Higher Dimensions - Numberphile
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