User Benjamin Dickman

122 votes

9 answers

6k views

Probability that a stick randomly broken in five places can form a tetrahedron

asked Apr 5, 2013 at 7:44

31 votes

1 answer

3k views

What number appears most often in an $n \times n$ multiplication table?

asked May 1, 2014 at 1:04

29 votes

1 answer

1k views

Recovering a finite group's structure from the order of its elements.

asked Oct 24, 2012 at 10:01

29 votes

5 answers

5k views

When the product of dice rolls yields a square

asked Dec 28, 2015 at 22:50

26 votes

1 answer

4k views

What is the optimal strategy in the "Factor Game"?

asked Oct 23, 2015 at 20:56

19 votes

5 answers

1k views

Proving a certain map on the closed unit disc must be the identity

asked Dec 10, 2013 at 0:51

18 votes

2 answers

784 views

Does every "balloon" (dragon, tadpole, canoe paddle) admit a graceful labeling?

asked Jun 23, 2014 at 7:03

17 votes

4 answers

2k views

Succinct Proof: All Pentagons Are Star Shaped

asked Sep 4, 2015 at 19:01

17 votes

5 answers

1k views

Polynomials $f$ and $f'$ with all roots distinct integers

asked Jun 6, 2017 at 19:20

15 votes

2 answers

722 views

Literature on Mathematical Problem Posing

asked Sep 11, 2012 at 8:04

14 votes

3 answers

1k views

Arc sums for a circle of $k$ positive integers whose total sum is $n$

asked Jan 21, 2013 at 1:26

12 votes

2 answers

984 views

Origin and use of an identity of formal power series: $\det(1 - \psi T) = \exp \left(-\sum_{s=1}^{\infty} \text{Tr}(\psi^{s})T^{s}/s\right)$

asked Jan 13, 2013 at 19:44

11 votes

5 answers

1k views

Max area: Quadrilateral with fixed perimeter and interior angle

asked Apr 30, 2018 at 18:37

9 votes

3 answers

457 views

Expected number of random diagonals before intersection

asked Dec 28, 2022 at 20:25

9 votes

2 answers

526 views

Evaluating $\int_{0}^{x} e^t \sqrt{2 + \sin(2t)} \, dt$

asked Nov 10, 2012 at 2:02

8 votes

1 answer

1k views

What is the set of triangular numbers mod $n$?

asked Sep 26, 2016 at 21:45

7 votes

3 answers

461 views

Dealing cards, derangements, and probability: Is the Riddler Express solution incorrect?

asked Jan 8, 2017 at 22:44

7 votes

2 answers

548 views

An alternating series identity with a hidden hyperbolic tangent

asked Jan 23, 2015 at 10:26

7 votes

3 answers

620 views

When is the number of $N$'s factors $1 + \sqrt{N}$?

asked Feb 26, 2015 at 5:29

7 votes

5 answers

1k views

Arranging $n$ balls in $k$ bins so that $m$ consecutive bins are empty

asked Dec 10, 2018 at 23:38

7 votes

2 answers

508 views

Mean and Median in a Classic River Crossing Problem

asked Nov 6, 2012 at 5:14

6 votes

1 answer

289 views

Maximum Regions Vees Can Divide a Circle

asked May 14, 2019 at 15:47

5 votes

1 answer

309 views

General technique to find partial sum formula for series such as $\sum n^3/2^n$

asked Oct 22, 2017 at 0:04

3 votes

1 answer

190 views

Identifying distinct colored cubes from faces of $2 \times 2 \times 2$ arrangement

asked Dec 15, 2017 at 20:00

3 votes

2 answers

229 views

Forcing Question about a sequence of functions from $\aleph_{0}$ into $2 = \{0, 1\}$

asked Feb 18, 2013 at 14:13

3 votes

1 answer

240 views

Imperfect digit-to-digit invariants in Base $10$

asked Mar 15, 2013 at 5:21

3 votes

2 answers

1k views

Adapting a proof on elements of order 2: from finite groups to infinite groups

asked Oct 26, 2012 at 23:12

2 votes

1 answer

876 views

Multiplication Table with a frame and picture of equal sum

asked Nov 1, 2012 at 19:36

2 votes

1 answer

78 views

Possible values of $\gcd(a+b, a\times b)$

asked Nov 13, 2014 at 20:18

2 votes

1 answer

231 views

Topological Conditions Equivalent to "Very Disconnected"

asked Jul 3, 2013 at 17:28

Stack Exchange Network

36 Questions

Probability that a stick randomly broken in five places can form a tetrahedron

What number appears most often in an $n \times n$ multiplication table?

Recovering a finite group's structure from the order of its elements.

When the product of dice rolls yields a square

What is the optimal strategy in the "Factor Game"?

Proving a certain map on the closed unit disc must be the identity

Does every "balloon" (dragon, tadpole, canoe paddle) admit a graceful labeling?

Succinct Proof: All Pentagons Are Star Shaped

Polynomials $f$ and $f'$ with all roots distinct integers

Literature on Mathematical Problem Posing

Arc sums for a circle of $k$ positive integers whose total sum is $n$

Origin and use of an identity of formal power series: $\det(1 - \psi T) = \exp \left(-\sum_{s=1}^{\infty} \text{Tr}(\psi^{s})T^{s}/s\right)$

Max area: Quadrilateral with fixed perimeter and interior angle

Expected number of random diagonals before intersection

Evaluating $\int_{0}^{x} e^t \sqrt{2 + \sin(2t)} \, dt$

What is the set of triangular numbers mod $n$?

Dealing cards, derangements, and probability: Is the Riddler Express solution incorrect?

An alternating series identity with a hidden hyperbolic tangent

When is the number of $N$'s factors $1 + \sqrt{N}$?

Arranging $n$ balls in $k$ bins so that $m$ consecutive bins are empty

Mean and Median in a Classic River Crossing Problem

Maximum Regions Vees Can Divide a Circle

General technique to find partial sum formula for series such as $\sum n^3/2^n$

Identifying distinct colored cubes from faces of $2 \times 2 \times 2$ arrangement

Forcing Question about a sequence of functions from $\aleph_{0}$ into $2 = \{0, 1\}$

Imperfect digit-to-digit invariants in Base $10$

Adapting a proof on elements of order 2: from finite groups to infinite groups

Multiplication Table with a frame and picture of equal sum

Possible values of $\gcd(a+b, a\times b)$

Topological Conditions Equivalent to "Very Disconnected"