This link has been bookmarked by 65 people . It was first bookmarked on 01 Aug 2006, by Mr Maher.
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3. The conjecture that there exists a Hadamard matrix for every positive multiple of 4.
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4. The twin prime conjecture (i.e., the conjecture that there are an infinite number of twin primes).
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5. Determination of whether NP-problems are actually P-problems.
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6. The Collatz problem.
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7. Proof that the 196-algorithm does not terminate when applied to the number 196.
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8. Proof that 10 is a solitary number.
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9. Finding a formula for the probability that two elements chosen at random generate the symmetric group
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10. Solving the happy end problem for arbitrary
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11. Finding an Euler brick whose space diagonal is also an integer.
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12. Proving which numbers can be represented as a sum of three or four (positive or negative) cubic numbers.
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13. Lehmer's Mahler measure problem and Lehmer's totient problem on the existence of composite numbers
such that 
, where 
is the totient function. -
14. Determining if the Euler-Mascheroni constant is irrational.
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15. Deriving an analytic form for the square site percolation threshold.
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Bruno MartinsThere are many unsolved problems in mathematics...
Fun Mathematics Unsolved algorithms geek interesting math maths problems puzzles reference sci-fi science weird
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erik tsThere are many unsolved problems in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known)
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moritzwadeThere are many unsolved problems in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include
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