Are there infinitely many twin primes?88%

Are there infinitely many perfect numbers?87%

Are there infinitely many primes of the form n^2 + 1?89%

Are there infinitely many sexy primes?91%

Are there any odd perfect numbers?21%

Are there any almost perfect numbers that are not powers of 2?17%

Is the Collatz conjecture true?91%

Is the quadrillionth digit of Pi a 6?15%

Is there a 5-State binary tape Turing machine that halts in more than 47176870 steps?40%

Is pi^pi^pi^pi an integer?4%

If the Collatz conjecture is false, what is the binary logarithm of the first published counterexample, or first published upper bound?826

Is Goldbach's Conjecture correct?92%

Is the Euler-Mascheroni constant transcendental?81%

Is the Euler-Mascheroni constant irrational?90%

What are the prime factors of RSA-2048?

What will be the first published counterexample to Collatz conjecture?

Is the 20th Busy Beaver number independent of set theory?39%

Is Haborth's Conjecture true?80%

How many noble polyhedra are there?104

Are any Millennium Prize problems undecidable/unprovable/unsolvable?53%