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177
Have any long-suspected irrational numbers turned out to be rational?
Jul 22 '10 at 16:25
49
What are the connections between pi and prime numbers?
Mar 3 '10 at 20:47
42
a categorical Nakayama lemma?
May 21 '12 at 1:37
41
Blackbox Theorems
Jun 13 '12 at 23:54
41
Transpositions of order three
Dec 10 '10 at 1:26
31
The factorial of -1, -2, -3, …
Dec 30 '09 at 12:00
30
Topological Characterisation of the real line.
Sep 22 '11 at 17:07
26
Largest possible volume of the convex hull of a curve of unit length
Dec 9 '11 at 6:27
26
Solve in positive integers $n!=m(m+1)$
Sep 18 '10 at 23:46
25
A question on the product of element orders of a finite group
Dec 3 '11 at 12:30
23
Are there ever three perfect powers between consecutive squares?
Apr 21 '11 at 1:26
23
Is the number of irreducible representations of G always bigger (or equal) to the number of irreducible representations of H, with H a subgroup of G?
Apr 4 '11 at 10:11
22
whence commutative diagrams?
Mar 24 '11 at 20:57
22
What is the limit of gcd(1! + 2! + … + (n-1)! , n!) ?
May 11 '10 at 19:58
22
Is there an explicit example of a complex number which is not a period?
Apr 5 '10 at 23:50
22
What is the origin of the term “spectrum” in mathematics?
Dec 16 '09 at 20:30
20
Bijection between irreducible representations and conjugacy classes of finite groups
Jul 22 '12 at 17:32
20
Math puzzles for dinner
Jun 29 '10 at 2:36
20
Newton and Newton polygon
Feb 18 '10 at 13:38
20
Your favorite surprising connections in Mathematics
Feb 8 '10 at 4:07
19
A profinite group which is not its own profinite completion?
Nov 29 '11 at 14:17
19
Status of the $x^2 + 1$ problem
Dec 7 '13 at 22:38
19
About integer polynomials which are sums of squares of rational polynomials…
Nov 28 '11 at 11:31
19
Is this pleasing polynomial irreducible?
Sep 9 '11 at 18:46
19
Zeroes of the random Fibonacci sequence
Aug 21 '11 at 23:24
19
Up to $10^6$: $\sigma(8n+1) \mod 4 = OEIS A001935(n) \mod 4$ (Number of partitions with no even part repeated )
Mar 22 '11 at 14:00
19
Google question: In a country in which people only want boys
Mar 12 '10 at 9:14
18
Primes with more ones than zeroes in their Binary expansion
May 18 '12 at 17:59
18
The sum of integers being a bijection
Dec 31 '10 at 12:25
18
How to recognise that the polynomial method might work
Oct 23 '10 at 22:42
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