Questions tagged [mathematics]

A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

36 questions with no upvoted or accepted answers
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12
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0answers
216 views

Translating a fiendishly exceptional automorphism of $S_6$ into a lay-math puzzle

Foreward: This post not a puzzle in itself, but an invitation for you to show off your puzzle-making skill regarding a given topic. Although the tag description of "puzzle-creation" seems to ...
12
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0answers
1k views

How would this binary-ish code be translated?

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11
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1answer
831 views

Weird and complex puzzle that we need help with

So basically this is a complex deep web puzzle and we're pretty much stuck at it right now as we don't have any idea what this is about, any help will be aprreciated (the attached images are the ...
9
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0answers
384 views

Dead By Daylight

This puzzle is a reference to a game, Dead By Daylight. Though you don't need a knowledge about the game. Consequently, there is no "video-games" tag. Story The Entity wants to have the ...
9
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0answers
393 views

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, ...
7
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0answers
302 views

Sequence Puzzle - First Question of 42

Professor Tera was walking on Connecticut Road, where there are some public restrooms. Tera saw some students standing in a row. They seemed to be playing a game called Evolution. And it looked like ...
7
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0answers
162 views

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.
7
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0answers
351 views

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 ...
5
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0answers
180 views

The Abnormality of me

I just got born. There's nothing I can do. Maybe "nothing" is such an appropriate word for an age 0. A year passed. There's still nothing I can do. I haven't changed. Maybe I am to retain my ...
5
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0answers
516 views

Locked Door Number Puzzle

I'm supposed to make a delivery to a crazed botanist. In case you're curious, the shipping manifest is: ...
5
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0answers
265 views

Find the missing element?

I've been trying to solve this for quite some time, can you help me solve it? This puzzle was made by one of my friend's teachers. This is not copyrighted and cannot be found anywhere on the internet. ...
3
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0answers
275 views

Fill in a 5x5 multiplicative magic square

Let's say you fill in a 5 by 5 square with the numbers 1, 2, ..., 25. Is there a way to fill it so that the product of the first row is equal to the product of the first column, the product of the ...
3
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0answers
194 views

Infected Cylinder and Torus

A variant of the well known Infected Checkerboard problem. If we've a 𝑛x𝑛 square, then we fold it along top and bottom row to form a cylinder. A cell in this cylinder becomes infected if at least ...
3
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0answers
140 views

Ideas on spatial puzzles for a city walk

Background. With the relaxation of covid-related restrictions, there was a need for intelligent city walks. Walk here is a moving between city objects by a certain (deterministic/stochastic) route. I ...
3
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0answers
175 views

The madness of a master

It was midnight. Mr. Holmes was suffering from abdominal pain, shortness of breath, pain in the bones, skin lesions and whatnot? So in this condition, why would Mr. Holmes drive to Brazilian Churches, ...
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192 views

Find Relation between the following numbers

If: $23×3=76$ $13×3=26$ $3×3=9$ $33×3=70$ Find $43×3=?$
2
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1answer
107 views

Patterns - they're everywhere!

You wake up in a room (again) that has two floors, Both have 3 puzzles. In order to escape, You have to find every answer in this order: Red Yellow Green Cyan Navy Pink and combine it together (eg if ...
2
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0answers
115 views

Does anybody know the history of this star/triangle puzzle?

Does anybody know the history of the puzzle posted by Mario Bilotti? Who created this puzzle? Who deserves the credit? Find 10 triangles in a five pointed star using two straight lines
2
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0answers
379 views

Not a sudoku, but still fun?

Context: I was trying to solve some of the puzzles on this site, when it occurred to me to make a puzzle variant myself. I immediately could construct one with my additional rule. Making an ...
2
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0answers
170 views

Even and primes puzzle?

this is secret numbers that increase regularly, what is the order? If you like numbers, it will be fun. $2^3 \times224299$ $2^2 \times 3^2 \times 19 \times 3557$ $2 \times 5 \times 320647$ $2 \times ...
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0answers
455 views

A robot moving on a grid. Part 2

This is an extension of the discussion A robot is placed on a grid point. At each move the robot must take three steps along the edge of the grid. After each step the robot must turn right. Lengths of ...
2
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0answers
134 views

Formula for the sequence 1, 1, 1, 21, 3, 1, 4, 1, 5, 1, 6,

The sequence 1, 1, 1, 21, 3, 1, 4, 1, 5, 1, 6, ... appeared in one of my tutorial sheets in 2019. I assumed that the fourth term, 21, was a mistake (was supposed to be ..., 2, 1, ...) then it made ...
2
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0answers
137 views

The Game of Numbers (#02)

Related to The Game of Numbers (#01) Agatha just decided it still isn't enough because she thinks it's way too easy. She decides to add one more rule to the list and change some of the existing rules. ...
2
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0answers
151 views

Minimum number of clues required for a 16 x 16 Sudoku

It is well-known that the minimum number of clues that completely specify a 9 x 9 Sudoku is 17. What is the minimum number of clues required for a 16 x 16 Sudoku whose cells contain one of the ...
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231 views

Code Breaking ( Sort of )

So someone sent me this code breaking/riddle to solve and I got really confused on it. I do need help on it, The Code needs to come out into a Phrase ( group of words ) CLUE 1: 2210232013400 - ...
2
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2answers
119 views

Not selling 100 pencils

A shop sells pencils only in boxes of fixed size. It cannot sell 100 pencils. It can sell any larger amount of pencils. It has one of each size box on display. question 1: What is the minimum amount ...
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189 views

The meaning of the related numbers

Question: What follows in the sequence below? 10233432943 As a hint, I must say I do not like the single 1 in it. It is unclear if the sequence even started with 1, but the 1 it needed. I had to ...
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0answers
109 views

Searching online catalogs is a pain. Can you tell me if it's worth my trouble?

Searching online catalogs is a pain. Can you tell me if it's worth my trouble? As an example, I searched the following online catalog of a well-known country-wide British outlet for the keyword "...
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0answers
120 views

How Do You Prove That This Puzzle Is Physically Solvable?

https://www.reddit.com/r/BeAmazed/comments/fyt7x9/it_seems_to_be_impossible_but_it_gets_done/?ref=share&ref_source=link The goal of the puzzle is to remove the wooden stick from the jar by ...
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0answers
596 views

Decode this message to stop the destruction of Science!

An extremist religious organization called "The Redeemed Against Scientific Usurpation of God's Authority", or RASUGA, have converted the world's leading time travel researcher to their ...
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113 views

Filling a sudoku/latin square like array

Let us build a square array in the following manner, which I would like to call a modified sudoku: 1) Every row and column contains only one copy of a positive entry and there are exactly $t$ such ...
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265 views

ARG Puzzle Gate 15 Help

Me and my group (yes I'm in a group trying to solve this) are currently working on an ARG puzzle and we are stuck. The first image/clue to the entire puzzle is what is seen below. The creator of this ...
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0answers
30 views

Get a expensive donut for 75% off!

You are going to a donut store, which donuts are more than 500 dollars. The most fancy one is the Donut Dedeluxe, which cost 5000 dollars. Luckily, they have a 75% off which is now 1,250. But, you ...
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0answers
86 views

Bisecting a 3D object into two equal volume objects - 2

Given the following 3D object and means of an unmarked ruler to draw lines on its surface define a straight cut that will split it into two objects with the same volume. Hint: It seems to have at ...
0
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0answers
158 views

The nice and round sequence

I have thought up a sequence, and I name it the nice and round sequence. Its first 10 numbers are 15773, 29694, 165083, 276316, 496325, 498512, 702504, 719466, 808667, 826245 What is its pattern? ...
-6
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1answer
181 views

Find the next number in the weird sequence

The following sequence has been made using a specific pattern and the last number is kept secret. We have to find that number along with the pattern followed to make the sequence. 3, 11, 32, 71, ...