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159
Have any long-suspected irrational numbers turned out to be rational?
mathoverflow.net

39
What are some examples of colorful language in serious mathematics papers?
mathoverflow.net

29
Jokes in the sense of Littlewood: examples?
mathoverflow.net

25
Mathematicians who were late learners?-list
mathoverflow.net

19
Is there a dense subset of the real plane with all pairwise distances rational?
mathoverflow.net

18
A binomial sum is divisible by p^2
mathoverflow.net

15
Mathematicians who were late learners?-list
mathoverflow.net

15
Why isn't there a structure with two primes?
mathoverflow.net

12
For which fields K is every subring of K…?
mathoverflow.net

11
What are the connections between pi and prime numbers?
mathoverflow.net

9
Can we characterize the Möbius transformations that maps the unit disk into itself?
math.stackexchange.com

9
What is the size of the smallest rigid extension field of the complex numbers?
mathoverflow.net

9
Hexagonal Triangular Squares
mathoverflow.net

8
Non-real constants
mathoverflow.net

8
Computing (on a computer) higher ramification groups and/or conductors of representations.
mathoverflow.net

7
Given a finite field $K$, what are the possible degrees of a polynomial $p\in K[x]$ such that $x\longmapsto p(x)$ is one-to-one?
mathoverflow.net

5
adding an n-th root to Q_p
mathoverflow.net

5
Modular congruences related to sums of Catalan numbers
mathoverflow.net

5
When does a p-adic function have a Mahler expansion?
mathoverflow.net

5
Polynomials vanishing modulo some integer $n$
mathoverflow.net