User Empy2

6 votes

0 answers

154 views

For which $(a,b)$ is $(round(an),round(bn))$ a 1-1 function?

asked Nov 13, 2022 at 12:38

7 votes

1 answer

288 views

How many ways to reach an integer by addition and multiplication

asked Jan 24, 2022 at 12:03

1 vote

1 answer

94 views

Size of a subset of $\mathbb{N}$

asked Oct 4, 2021 at 14:14

3 votes

0 answers

141 views

Hypercube bisector: Does this alternating sum have a limit?

asked Aug 6, 2021 at 14:05

1 vote

2 answers

155 views

Split $\{1,...,3n\}$ into triples with $x+y=5z$ - no solutions?

asked Jul 10, 2021 at 17:30

4 votes

0 answers

441 views

Split $\{1,2,...,3n\}$ into triples with $x+y=4z$

asked Jul 4, 2021 at 16:15

2 votes

0 answers

79 views

Coloring of small chessboards on the torus

asked Oct 8, 2020 at 13:06

3 votes

1 answer

548 views

Version of Fitch Cheney's card trick

asked Apr 21, 2019 at 16:15

4 votes

2 answers

746 views

Circumradius of a tetrahedron

asked Jun 15, 2018 at 2:19

3 votes

1 answer

152 views

What is the dimension of this fractal curve?

asked Dec 10, 2017 at 8:51

5 votes

1 answer

97 views

Sum of factors from consecutive sequence

asked Aug 31, 2016 at 5:21

2 votes

0 answers

146 views

Chessboard four-colour theorem

asked Mar 25, 2016 at 13:01

1 vote

2 answers

144 views

Pointless probability

asked Feb 14, 2016 at 4:33

9 votes

1 answer

247 views

Binomial sum gives $4^n$

asked Jan 1, 2016 at 1:08

25 votes

1 answer

858 views

Fibonacci-related sum

asked Jan 9, 2015 at 11:18

2 votes

1 answer

95 views

Armstrong numbers in base 90

asked Oct 21, 2014 at 7:00

4 votes

0 answers

153 views

$Z_n \backslash \{0\}$ splits into octets

asked Jul 17, 2014 at 5:22

3 votes

0 answers

113 views

Typical dimension of eigenspace

asked Jun 4, 2014 at 8:42

9 votes

1 answer

502 views

Guess the number of a liar

asked May 17, 2014 at 13:36

6 votes

1 answer

5k views

Number of normals from a point to an ellipse

asked Dec 16, 2013 at 17:43

1 vote

1 answer

176 views

A game theory question about tiles, part 2

asked Sep 16, 2013 at 14:43

3 votes

2 answers

162 views

Lowest score never made

asked Sep 16, 2013 at 14:21

1 vote

1 answer

41 views

Cubic with turning point near zero

asked Jul 7, 2013 at 14:03

2 votes

0 answers

418 views

Square pairs in other bases

asked Jun 30, 2013 at 11:49

1 vote

0 answers

711 views

how many ways to make change, asymptotics

asked Jun 25, 2013 at 8:24

3 votes

2 answers

266 views

seventeen tiles on a torus

asked Jun 24, 2013 at 17:18

2 votes

1 answer

175 views

Average number of $U[0,1]$ random numbers to reach $x$

asked Jun 21, 2013 at 17:27

15 votes

1 answer

807 views

Narcissistic numbers in other bases

asked Jun 21, 2013 at 2:40

3 votes

1 answer

216 views

How fast does $f_n = \sin f_{n-1}$ approach zero? [duplicate]

asked Jun 20, 2013 at 14:36

1 vote

0 answers

25 views

Short-cut to a group of long sums/differences

asked Jun 18, 2013 at 12:13

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33 Questions

For which $(a,b)$ is $(round(an),round(bn))$ a 1-1 function?

How many ways to reach an integer by addition and multiplication

Size of a subset of $\mathbb{N}$

Hypercube bisector: Does this alternating sum have a limit?

Split $\{1,...,3n\}$ into triples with $x+y=5z$ - no solutions?

Split $\{1,2,...,3n\}$ into triples with $x+y=4z$

Coloring of small chessboards on the torus

Version of Fitch Cheney's card trick

Circumradius of a tetrahedron

What is the dimension of this fractal curve?

Sum of factors from consecutive sequence

Chessboard four-colour theorem

Pointless probability

Binomial sum gives $4^n$

Fibonacci-related sum

Armstrong numbers in base 90

$Z_n \backslash \{0\}$ splits into octets

Typical dimension of eigenspace

Guess the number of a liar

Number of normals from a point to an ellipse

A game theory question about tiles, part 2

Lowest score never made

Cubic with turning point near zero

Square pairs in other bases

how many ways to make change, asymptotics

seventeen tiles on a torus

Average number of $U[0,1]$ random numbers to reach $x$

Narcissistic numbers in other bases

How fast does $f_n = \sin f_{n-1}$ approach zero? [duplicate]

Short-cut to a group of long sums/differences