Unanswered Questions
82 questions with no upvoted or accepted answers
22
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0
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REALLY important days in history
@Z. Dailey asks a mathematical puzzle Important days in history... and to come! with a series of dates in years 1973, 1978, 1983, 1992, 2005.
My puzzle asks the question: What is the previous date in ...
- 197
17
votes
0
answers
319
views
Edge Removal Game
There is a complete undirected graph with n nodes (n > 1). Alice and Bob take turns removing one edge from the graph, with Alice going first. The player whose move causes any node to become ...
- 2,572
15
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0
answers
2k
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13
votes
0
answers
393
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The Snake and the Hunter
The Snake and the Hunter is a game for two players who play in two rounds interchanging the roles of snake and hunter. The game is played in a rectangular grid of points, say 6×6. In both rounds the ...
- 19.7k
11
votes
0
answers
557
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I'm a number with a special product, so name me when you think you've got it
In the blocks that come before,
their special product tells us more.
To guess my scheme you'll need calculation,
but only little tests of recreation.
Each block contains atoms strong as Thor,
...
- 2,306
9
votes
0
answers
380
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A Glutton and a Split Check
N, T, A, B are arbitrary constants in this problem. I have only definitively solved the N=1 subproblem, so, if the general problem cannot be solved, I will be satisfied to mark as accepted a solution ...
- 2,381
8
votes
1
answer
564
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An endless succession of harmless checks
Similarly to my previous chess instalment, this puzzle continues to explore the underlying geometry to be found in a sequence of consecutive checks. This time however, we will ditch the limiting ...
CommunityBot
- 1
8
votes
0
answers
513
views
Secret message from a kitten (definitely not a cosmic horror from beyond time)
Can you decrypt this secret message?
Transcript:
...
- 10.9k
8
votes
0
answers
302
views
Doubling the cube with rational Meccano strips
In three monographs published in 2006, 2008 and 2014 Gerard 't Hooft considered "Meccano mathematics": how to construct specified distances and regular polygons by a rigid system of ideal ...
- 10.2k
8
votes
0
answers
346
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Even and primes puzzle?
These are secret numbers that increase regularly. What are the next two numbers?
If you like numbers, it will be fun.
$2^3 \times224299$
$2^2 \times 3^2 \times 19 \times 3557$
$2 \times 5 \times ...
- 6,631
8
votes
0
answers
216
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Is it possible to create a knot that is locked only when the rope is stretched?
Is it possible to create a knot that is stable/locked when the rope is stretched?
When the tension is relived the knot should open.
- 8,381
7
votes
0
answers
371
views
Under unusual daylight, delicate leaves rustle lightly
5th September 1964, ??:??:?? (UTC), somewhere in Romania: Under unusual daylight, delicate leaves rustle lightly, revealing bright autumn skies - Bob's set is reversed. (B > b)
How does that sum to ...
- 13.8k
7
votes
0
answers
235
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In an infinite maze of squares with p% walls, will you be boxed in?
If you are in an infinite maze of squares, where each border between two squares has a $p$% chance of being a wall, what is the probability $F(p)$ that you are trapped in a finite space?
For a better ...
- 171
7
votes
0
answers
407
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Open the French safe
While walking in a small alley in Paris, you come across a safe.
The number pad looks like this :
There are things on the back of the safe too :
"À l'aide du carré 3x3 ci-dessous et des nombres ...
- 1,106
6
votes
0
answers
330
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What are the numbers trying to say?
These numbers are trying to tell you something about them, but what could it be?
Starter hint:
Helpful hint:
Attribution: I came up with this one myself.
- 61