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  1. List of unsolved problems in mathematics - Wikipedia

  2. 6 Deceptively Simple Maths Problems That No One Can Solve

  3. Millennium Prize Problems - Wikipedia

  4. 10 Math Equations That Have Never Been Solved - Interactive Mathematics

  5. Top 10 Unsolved Math Problems of All Time - GeeksforGeeks

  6. Unsolved Problems -- from Wolfram MathWorld

  7. Category:Unsolved problems in mathematics - Wikipedia

  8. 10 Hard Math Problems That May Never Be Solved - Popular Mechanics

  9. AIM Problem Lists

  10. Unsolved Mathematics