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List of unsolved problems in mathematics - Wikipedia
6 Deceptively Simple Maths Problems That No One Can Solve
Millennium Prize Problems - Wikipedia
10 Math Equations That Have Never Been Solved - Interactive Mathematics
Top 10 Unsolved Math Problems of All Time - GeeksforGeeks
Unsolved Problems -- from Wolfram MathWorld
Category:Unsolved problems in mathematics - Wikipedia
10 Hard Math Problems That May Never Be Solved - Popular Mechanics
AIM Problem Lists
Unsolved Mathematics