Question

Does there exist a non-trivial group that is both perfect and complete?

score 281 · Answer 1 · 2026-03-26 00:13:42

281

Views

Does there exist a non-trivial group that is both perfect and complete?

Published on 26 Mar 2026 - 0:13

score 3k · Answer 2 · 2026-03-25 18:45:49

3k

Views

Extending prime numbers digit by digit while retaining primality

Published on 25 Mar 2026 - 18:45

score 171 · Answer 3 · 2026-03-25 23:42:25

171

Views

number of ways to tile a $n\times n$ grid with $k<n^2$ $1\times 1$ tiles?

Published on 25 Mar 2026 - 23:42

score 170 · Answer 4 · 2019-06-17 11:13:30

170

Views

Hamiltonian circuits on rectangular graphs

Published on 17 Jun 2019 - 11:13

score 54 · Answer 5 · 2019-06-22 07:10:46

54

Views

A drunk knight's tour

Published on 22 Jun 2019 - 7:10

score 106 · Answer 6 · 2019-06-23 21:57:08

106

Views

Find large $n$ and calculate $r \equiv L \pmod{n}$ where $L = 999\,998\,997\dots003\,002\,001.$

Published on 23 Jun 2019 - 21:57

score 97 · Answer 7 · 2019-06-24 18:50:58

97

Views

Challenging Mathematical Teasers; Pecking Order

Published on 24 Jun 2019 - 18:50

score 74 · Answer 8 · 2019-06-25 19:44:03

74

Views

What are the fractal patterns produced by coloring according to digit sums of coordinates?

Published on 25 Jun 2019 - 19:44

score 246 · Answer 9 · 2019-06-26 04:53:54

246

Views

$ 4x -5y + 24z = 4A $, $ 2x - 2y + 2z = 10$. What is the largest possible value of $A$?

Published on 26 Jun 2019 - 4:53

score 29 · Answer 10 · 2026-03-25 11:18:47

29

Views

Generalization of Specialized Card Sort

Published on 25 Mar 2026 - 11:18

score 232 · Answer 11 · 2026-03-26 03:01:37

232

Views

A "proof" for $0=1$ by integrating $\int \frac{dx}{x\ln x}$ by parts

Published on 26 Mar 2026 - 3:01

score 191 · Answer 12 · 2019-06-28 08:52:07

191

Views

Find absolute position of objects when only distances are known.

Published on 28 Jun 2019 - 8:52

score 297 · Answer 13 · 2019-06-28 11:49:58

297

Views

Deceptively difficult coin weighing puzzles

Published on 28 Jun 2019 - 11:49

score 593 · Answer 14 · 2019-06-29 19:15:55

593

Views

How to get 5 from the numbers {6, 7, 8, 9} using only addition, subtraction, division, and multiplication.

Published on 29 Jun 2019 - 19:15

score 274 · Answer 15 · 2019-06-30 00:21:34

274

Views

How to get $6$ from the numbers $\{6, 7, 8, 9\}$ using only addition, subtraction, division, and multiplication.

Published on 30 Jun 2019 - 0:21

List Question

Does there exist a non-trivial group that is both perfect and complete?

Extending prime numbers digit by digit while retaining primality

number of ways to tile a $n\times n$ grid with $k<n^2$ $1\times 1$ tiles?

Hamiltonian circuits on rectangular graphs

A drunk knight's tour

Find large $n$ and calculate $r \equiv L \pmod{n}$ where $L = 999\,998\,997\dots003\,002\,001.$

Challenging Mathematical Teasers; Pecking Order

What are the fractal patterns produced by coloring according to digit sums of coordinates?

$ 4x -5y + 24z = 4A $, $ 2x - 2y + 2z = 10$. What is the largest possible value of $A$?

Generalization of Specialized Card Sort

A "proof" for $0=1$ by integrating $\int \frac{dx}{x\ln x}$ by parts

Find absolute position of objects when only distances are known.

Deceptively difficult coin weighing puzzles

How to get 5 from the numbers {6, 7, 8, 9} using only addition, subtraction, division, and multiplication.

How to get $6$ from the numbers $\{6, 7, 8, 9\}$ using only addition, subtraction, division, and multiplication.

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