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3
votes
1answer
39 views

Cryptic Family Reunion: Sgt. Sequence Rides Again!

The answer to this puzzle is a list of ten thematically related words or proper names or phrases. Each of these is clued cryptically, and the theme is to be determined. NOTE: While the theme mostly ...
0
votes
0answers
60 views

Are there Sudokus that are so hard that no known logical deduction techniques can reduce it? [duplicate]

Are there Sudokus that are so hard that no known logical deduction techniques can reduce it? Maybe such a technique would reduce away multiple options?
6
votes
1answer
89 views

What kind of car do I have?

What kind of car do I have? The clue words: stories, robbery, rock, minimum, old, ducks
-6
votes
0answers
88 views

A puzzle with seventy-two countries

Let's have two groups of countries. Each group has 36 countries. The first letter of the countries in the first group start with A,B,C,E,G,S. The second group of countries has as first letter T,I,K,L,...
4
votes
0answers
122 views

What is the shortest English–language sentence which contains 25 unique letters? [closed]

There is a lot of literature on the subject of short English pangrams, that is, sentences that contain every letter. But I am curious what the shortest, or at least some of the shortest, sentences are ...
7
votes
1answer
334 views

Falling out with the Judge II

All by oneself: thrown out car, rotten feed, and amount of food found outside bird's house (18) The bird was never found again, and no fingerprints could be found on the car or the food. What ...
-1
votes
1answer
83 views

A quick Riley Riddle

My prefix is a term for individuals of a certain gender My suffix is a particle with an electron owed My infix is a misnomer for ASCII code And I am a sprawling abode What am I?
-3
votes
0answers
70 views

Show that : $n =E(n*LOG((10*n)/(1+n))+1)$, $n> 0$, n integer? [closed]

Show that $$n =E(n*LOG((10*n)/(1+n))+1)$$ for $n> 0$ , $n$ is integer and E integer part(The ENT function on excel).
-2
votes
0answers
60 views

speed and acceleration of car [closed]

There is a road with length l meters. The start of the road has coordinate 0, the end of the road has coordinate l. There are two cars, the first standing at the start of the road and the second ...
19
votes
3answers
521 views

Density in Den Sitting

Please find below a word search puzzle. But it's not just any word search...the words you find cannot be too dense. The definition of a word in this puzzle: appears in /usr/share/dict/words:https://...
5
votes
2answers
421 views

Tribute to Eugene Varshavsky bwahhahahahahahahah

Each cell in the lower-right 9x9 grid must contain a positive integer or be left blank. Numbers on the outside of the grid indicate the sums of one or more adjacent digits in that row or column, in ...
2
votes
0answers
101 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 ...
0
votes
0answers
39 views

How to reconstruct the explicit form of a function? [closed]

There is a function $f(x,y)=z$, and $2\cdot x<y$; $x, y, z \in N$ such that $f(x=2, y=5)=32$ $f(x=2, y=6)=36$ $f(x=2, y=7)=40$ $f(x=3, y=7)=48$ $f(x=3, y=8)=52$ $f(x=3, y=9)=56$ Question. Can ...
11
votes
4answers
2k views

77-digit number divisible by 7 with seven 7s

The smallest number divisible by 7 with seven 7s is trivially 7777777. Then, what is the greatest 77-digit number divisible by 7 which contains seven 7s?
3
votes
1answer
86 views

Positions of my fixes

My prefix lost its original position My suffix is in a different position My infix is in a fatal position My whole switched position
6
votes
1answer
277 views

Falling out with the Judge

Poor defense speech leading to defendant finally being thrown out (14) The defendant never reached their prison cell. How did they die? jafe helped design the clue - thanks! :)
-5
votes
1answer
128 views

An easy puzzle to solve

Which country's name cannot be written using only the first letter of any other country on the planet? For clarification, the first letters of the countries below spell GREECE. Germany Romania Equador ...
16
votes
6answers
3k views

Logical puzzle from a math homework for Russian fifth-year school students

The daughter of a relative of mine, a fifth-year school student in Russia, got the following math homework from her teacher: Here's my translation: Logical task No. 26. Students were solving a task ...
10
votes
1answer
220 views

Please feature this meta post

My first could describe a call or a fell, in two ways, And it sounds like a way of going fast in olden times. My second could describe a paper or a cloud, in two ways, And docked it's almost my first, ...
1
vote
1answer
78 views

Minimise battle time in Monster's Den

So there is this excellent flash game, Monster's Den. In order to make a high score, I must complete many battles..this question is about battles with the Legendary Monsters. The target is to reduce ...
8
votes
1answer
162 views

Cryptic Family Reunion: Flowing ever on

The answer to this puzzle is a list of ten thematically related words or proper names or phrases. Each of these is clued cryptically, and the theme is to be determined. Since the definition part of a ...
15
votes
0answers
230 views

Tubariphobia - The fear of pickles

There are many topics that polarize. But not a single topic comes close to the one and only, age-old question that some claim is the root of all division between people: "Are pickles disgusting ...
-4
votes
1answer
141 views

NSE iq test please teach me [closed]

http://free.ultimaiq.net/nse.htm 35, 147, ?, 2387 357, 1251, 152, ?, ?, 0 452801, 773924, 102410, 471056, ? 011010, 100010, 100010, 100010, 000010, ?, 100010 1001, 4524, 4299, 3984, ? 91420512, ...
35
votes
1answer
1k views

This new puzzle type needs a name {EXTREME EDITION}

A companion puzzle to the 'This new puzzle type needs a name' series, and inspired in part by @JeremyDover's answer to a recent question. Usually, puzzles in this series comprise a mash-up of two ...
2
votes
2answers
176 views

Are you guys ready for a QUESTion?

Chase me and my feet are not slow Catch me then skywards I go What am I? Hints:
8
votes
2answers
1k views

Someone Shoot Me!

Real-life situation, this time. I was at work the other day and had just done something. I needed to tell a coworker he needed to do it as well, but he was on the phone at the time. Not wanting to ...
11
votes
1answer
459 views

No Holds – a barred crossword

Across 1. Country girls finally returning home after being swallowed by snake (6) 6. Strong desire to omit essential part in writing important text (1,5) 11. Error usually eliminated within split ...
3
votes
1answer
161 views

Issues with Graph-It (Geometry Homework)

You are working on your geometry homework (graphic quadratics) and become bored of drawing the axes over and over again. Instead, you find an online tool called Graph-It that you use to graph the ...
5
votes
1answer
828 views

849, 352, 768, 493, 527 - Unusual number sequence problem

The sequence is: 849 352 768 493 527 This one has been puzzling me for days. I would appreciate any insight.
12
votes
1answer
962 views

What should I do with these emails?

I've been sent a bunch of very odd emails recently, starting on Monday and sent daily until last Thursday. I'm not 100% sure what they mean or why I am being sent them, but perhaps you could help me. ...
0
votes
0answers
103 views

That's fine, most of my family doesn't want to acknowledge being related to me either

Today I share a 100% true story from my past. I use to meet my little brother to eat together with him regularly, but any time his friends or others that knew him would meet me the conversation always ...
1
vote
1answer
63 views

119, 019, 609, 809, ?, 909 - A number sequence

This is probably very elementary for seasoned puzzlers yet I must request assistance with the following sequence: 119, 019, 609, 809, xxx, 909 What is the underlying principle here? Edit: Source: 2.2.,...
13
votes
6answers
919 views

A nice robot-control puzzle

The goal is to find a sequence (a "program") of max 6 commands that will move the triangle (the "robot") through the grid and make it visit all the squares marked with a star. Two ...
6
votes
3answers
463 views

How to divide their loot? The thieves' dilemma

Three thieves rob a jewelry store at gunpoint and end up with the following loot. 10 necklaces 8 bangles 6 rings It so happened that the jewelry was antique and valuable. They asked the scared ...
1
vote
0answers
168 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 ...
3
votes
1answer
216 views

Kaboom-y numbers!

Here is a new type of puzzle poem I made. Enjoy! Note: The title is named like that for a reason. I have a number in mind, it is super cool, But there's something you need to know, or you will find ...
3
votes
1answer
186 views

Will forcing chains break this sudoku puzzle?

I am trying to pick up advanced sudoku techniques by practicing with “difficult” puzzles as suggested by my sudoku app. In this puzzle, I am stuck in the position as shown below. I think I can make ...
-2
votes
0answers
63 views

The Hungry Good People

So, there are these 5 good people. They have 5 bowls of roast chicken (one per person). They need to use both a spoon and a fork to eat. Only two people have a pair of utensils. They also are going to ...
13
votes
1answer
508 views

Pentominous - P is for…

This is a Pentominous puzzle. Rules of Pentominous: Dissect the grid into regions of 5 cells each. No two regions of the same shape can be adjacent (but they may touch at a corner). Rotations and ...
4
votes
3answers
168 views

Are we scoring numbers now?

So from a couple other puzzles, you might remember that I'm a professor of Awesomeness at the Ad Hoc University! This time, I've given my students some numbers and their scorez. They need to tell me ...
16
votes
1answer
458 views

Lap Theory Optimal Betting Game

Three prisoners are seated at a table. Each of them has a mobile phone on their lap, and they are not allowed to look at anyone else’s phone (and obviously no other form of communication is allowed). ...
-2
votes
0answers
993 views

Need Your Help Please [closed]

When all is shadowed, dark as night, Just look for me out in the light. from June's Journey Railway Riddles
15
votes
1answer
302 views

Renegade, epitasis, and then what?

Complete this finite convoluted sequence of words renegade, epitasis, nihilist, etiolate, gallinae, ...
17
votes
1answer
292 views

Pentominous - Niftily

This is a Pentominous puzzle. Rules of Pentominous: Dissect the grid into regions of 5 cells each. No two regions of the same shape can be adjacent (but they may touch at a corner). Rotations and ...
1
vote
1answer
118 views

Unusual connections of numbers

Let's have the equation $(DX)^2-Y^2= ± Z^5$ and $x,y$ two positive integers greater than zero. From some facts we can obtain solutions of the above equation by giving integer values at $x,y$. Examples:...
0
votes
1answer
177 views

Z1 = 1, Z2 = 36, Z3, Z4 = 38346, Z5 = 1246285 … Zn, find Z3 and Zn?

$Z_1 = 1, Z_2 = 36, Z_3=?, Z_4 = 38346, Z_5 = 1246285, ...$, find $Z_3$ and $Z_n$? For info I have already $Z_n$; I just want to compare the results. And if you want more value from this series I can ...
4
votes
5answers
581 views

Covid19 puzzle - count of people in a mall [closed]

There is a mall with 4 entrances, in each entrance is standing a doorman with a counter who counts the amount of people who entered through that entrance. If the counter reaches 200, the doorman ...
2
votes
2answers
132 views

3 switches and 4 lights

The are three switches (1, 2 and 3) and four lights (A, B, C and D). Each switch turns on exactly two lights and no two switches turn on identical lights. You know that Lights A, B and C are on when ...
5
votes
3answers
305 views

A Collatz Conjecture for a Classic Conundrum

There is a famous puzzle that asks for the next line (and the rule) for the following pattern: 1 11 ...
6
votes
1answer
424 views

My prefix starts with blood, My whole is the sight of blood

My prefix starts with blood. My suffix gives you permission. My infix goes really fast. My whole is the sight of blood.

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