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%