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  1. These Are the 10 Hardest Math Problems Ever Solved - Popular Mechanics

  2. List of unsolved problems in mathematics - Wikipedia

  3. 7 of the hardest problems in mathematics that have been solved

  4. 13 World’s Hardest Math Problems | With Solutions – Engineerine

  5. 10 Math Equations That Have Never Been Solved

  6. Millennium Prize Problems | Brilliant Math & Science Wiki

  7. After cracking the “sum of cubes” puzzle for 42, mathematicians ...

  8. 5 of the world’s toughest unsolved maths problems

  9. 10 Hard Math Problems That May Never Be Solved - Popular Mechanics

  10. Are Mathematicians Close to Solving This Notorious Math Problem?