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• 105 Have any long-suspected irrational numbers turned out to be rational?
• 88 Tweetable Mathematics
• 41 An example of a beautiful proof that would be accessible at the high school level?
• 26 Is there an elementary way to find the integer solutions to $x^2-y^3=1$?
• 20 Not especially famous, long-open problems which anyone can understand
• 19 Not especially famous, long-open problems which anyone can understand
• 19 Does this variant of a theorem of Hasse (really due to Gauss) have an "elementary" proof?
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