Unanswered Questions
21 questions with no upvoted or accepted answers
22
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0
answers
2k
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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
6
votes
0
answers
254
views
Sequence puzzle: 3, 9, 27
A twist of the classic sequence game:
A friend asked me to find the rule to this sequence: 3, 9, 27.
I am allowed to suggest other sequences to test if they follow that (unknown to me) rule, to which ...
- 10.3k
6
votes
0
answers
511
views
Rare but Abundant in Hill and Hole
I am uncommon,
But a worthy goal.
Rare but abundant
In hill and hole.
Who am I?
You may already know the answer, so the task is not to answer the riddle per se, but to solve the following 'What is a ...
- 27.7k
6
votes
0
answers
302
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.
...
- 41.7k
5
votes
0
answers
265
views
Longest Fibonacci word
Fibonacci words are defined as $F_0 = a, F_1 = b, F_{n+2} = F_nF_{n+1}$ where $a, b$ are letters. How can you find the longest Fibonacci sub-word in a given string?
Try to solve it in linear time ($O(...
- 151
4
votes
0
answers
333
views
Lucas's interesting cipher
Lucas was fooling around with some letters when he encoded some text into Gsobj lwmtkd sbceugb vfy rgdjb.. Can you figure out the original text he had?
4
votes
0
answers
234
views
The smallest number
Some time ago I created a program to generate a table, and printed the first seven rows and columns.
Somehow however I forgot to print the headers and the title of the table.
I only remember that it ...
- 229
4
votes
1
answer
561
views
Formula for the sequence 1, 1, 1, 21, 3, 1, 4, 1, 5, 1, 6, ... if the 21 isn't a mistake
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 ...
- 10.3k
4
votes
1
answer
660
views
Find next element of the sequence
Source of the question: Taken from the sub-Reddit r/askmath here: https://www.reddit.com/r/askmath/comments/15ar3ne/looking_for_the_answer_to_the_following_sequence/
What is the next element of the ...
- 4,057
3
votes
0
answers
156
views
The Mono-Quantum Condrum
You are presented with a locked box, and on its surface, you notice a sequence of peculiar symbols:
⌬ ⌅ ⊙ ⊡
Next to the symbols, there's an inscription:
...
- 147
3
votes
0
answers
171
views
Odd one's out (sequence)
Once upon a time, there was a curious mathematician named Friedrich. One day, while exploring a new area of mathematics, he stumbled upon an intriguing sequence of numbers:
0, 1, 2, 2, 4, 3, 3, 4, 4, ...
- 53
3
votes
0
answers
226
views
An Assortment of Letters
Can you figure out how I've split the below letters into their groups?
Group 1
Group 2
D H L S
F P T Y
Group 1
Group 2
Group 3
C D H J N P V W Y
L T M
S B R
Group 1
Group 2
Group 3
Group 4
Group ...
- 3,449
3
votes
0
answers
7k
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The New York Time's "Letter Boxed" Puzzle (spoiler)
WARNING: I solved this puzzle and posted a solution below. I'm posting this more for muse.
Hello! I don't know if anyone's enjoyed this puzzle on The New York Times website, but I find it rather fun. ...
- 10.3k
2
votes
0
answers
164
views
Sequence of shapes with lines and dot
This is another puzzle from Lanrt-F IQ test that was posted on Reddit
https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fmy-favourite-2-problems-from-lanrt-f-v0-58puclks5a6d1.png%3Fwidth%...
- 16.2k
2
votes
0
answers
318
views
What's the missing number related to primes?
I would like to draw your attention to this mathematical sequence related to prime numbers I've created and ask what the missing number is.
2, 5, 27, 182, 2310, 27200, ______, 8998400, 223092870, ...
- 29