Questions tagged [number-property]
Puzzles that use number properties such as even and odd, multiples of numbers, part of a well-known sequence (i.e. Fibonacci) or theorem (Pythagorean relations) or others in part of the method to solve the question.
99
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votes
1
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What is the Color Code™?
Inspired from Can you name the country code? and What is a Number™? series
$
\begin{gather}
% custom template - reuse if you may
\def\S#1#2{\Space{#1}{21px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}}...
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7
votes
9
answers
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Multilanguage generalization of "What number is that? Asks Grandpa"
This is a multilingual generalized follow-on to "What number is that? Asks Grandpa", which I restate as:
"What is the smallest positive English integer N, for which if you take its WORD anagram and ...
- 890
5
votes
1
answer
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Follow the path of relation through the grid #6
There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
- 2,296
5
votes
2
answers
236
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Follow the path of relation through the grid #5
There is a relation between rectilinear-adjacent squares such that there is a unique rectilinear path from the top-left corner of the grid down to the bottom-right corner of the grid. Each square can ...
- 2,296
6
votes
4
answers
1k
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What is larger than largest, your intuitions are tarnished. (What am I?)
You might call me a number,
but that would be a blunder.
In class you may have been told otherwise,
but I tell you now that those were all lies.
I'm in the deck of the cards,
as big as them come.
...
- 2,296
1
vote
1
answer
113
views
A simple matter of relations (What am I?)
Don't overthink it,
just a little fun.
Relations are part of graphs,
of which I am one.
What is my relation?
Hint 1
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4
votes
1
answer
173
views
Which node(s) does 0 connect with in this simple graph?
If we add 0 as a node to the graph below, which node(s) will it connect to?
Hint 0
Hint 1
Hint 2
- 2,296
10
votes
0
answers
479
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,
...
- 2,296
19
votes
1
answer
1k
views
What node does 11 point to?
If we included 11 in the diagram below, which node would it connect to?
Hint 1
- 2,296
2
votes
1
answer
111
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Pandigital Puzzle
Can you find the 10 digit number* which contains each of the digits 0-9* exactly once, and when divided by 9 the quotient is a perfect cube which has the digit 7 in it exactly twice*?
*in its base 10 ...
- 475
6
votes
1
answer
597
views
Who's that Simple Pokémon™?
For every alphabet (A to Z), there exists at most one corresponding Simple Pokémon™. As of Generation 8, it goes:
...
- 4,125
8
votes
2
answers
625
views
Which famous mathematical constant can be celebrated on these dates?
Which famous mathematical constant can be celebrated on these dates?
April 11, 2020
April 12, 2021
April 12, 2022
April 12, 2023
April 11, 2024
April 12, 2025
April 12, 2026
April 12, 2027
April 11, ...
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6
votes
1
answer
198
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Numbers with vowels used twice
This question is linked to Numbers in series
If you write out the numbers the British way (using "and")
What is the smallest number that has all the vowels used exactly
twice.
What is the ...
- 39.2k
6
votes
1
answer
178
views
Find the location of the royal artifacts
London, 13:20
While media and experts are still baffled on how Inspector Arbor caught Norman Erdmann (can you solve it? See here) Arbor himself has no time to rest.
Police has already questioned ...
- 790
6
votes
1
answer
446
views
Mathematical Coincidence
A friend came up to me today with a deck of cards, and put these 6 into a group:
2 3 5 7 J K
The other 7 values went into another group:
A 4 6 8 9 10 Q
He then challenged me to find the reason ...
- 6,768
8
votes
3
answers
1k
views
What comes next in this sequence, and why?
I'm having the hardest time with this sequence puzzle. The mobile game I play (which asked me the question) doesn't provide answers or explanations for incorrect answers, and I'm searching online so I ...
- 321
6
votes
2
answers
836
views
What is the name of AB×B×A=BBB puzzles?
Some puzzles goes as follows: Solve AB×B×A=BBB, where different letters denote different numbers and A and B are not zero.
What is the name for these types of puzzles?
Edit. I fixed my mistake in ...
- 1,699
11
votes
1
answer
791
views
What is an IJKLMN Number™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.
If a number conforms to a special rule, I call it an IJKLMN Number™.
Use the following examples ...
- 5,621
8
votes
3
answers
695
views
Discover the six-character password!
You are given several pieces of paper which are as follows:
(Unfortunately, a textual rendering is very difficult with this puzzle, so if someone can offer a suggestion on how to do it, that would be ...
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-1
votes
1
answer
154
views
-1
votes
1
answer
247
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Number whose letters are in alphabetical order [duplicate]
Can you find the smallest number whose letters are in alphabetical order when spelled out in English?
- 33.2k
-3
votes
1
answer
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Find missing number in the transformation 2 [duplicate]
Can you find the missing number? This number has a single digit.
1 → 3
3 → 5
5 → 4
4 → ?
Good luck!
- 33.2k
9
votes
2
answers
435
views
What is an Encoding Number™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.
If a number conforms to a special rule, I call it an Encoding Number™.
Use the following ...
- 5,621
5
votes
2
answers
296
views
Find missing number in the transformation
Can you find the missing number? This number has a single digit.
8 → 7
7 → 3
3 → 5
5 → ?
Good luck!
- 33.2k
12
votes
1
answer
535
views
What is a Heptagon Number™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.
If a number conforms to a special rule, I call it a Heptagon Number™.
Use the following ...
- 5,621
30
votes
1
answer
2k
views
What is a BEN Number™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.
If a number conforms to a special rule, I call it a BEN Number™.
Use the following examples ...
- 5,621
7
votes
2
answers
1k
views
What is a Finale Number™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.
If a number conforms to a special rule, I call it a Finale Number™.
Use the following examples ...
- 5,621
15
votes
1
answer
358
views
What is a Hope & Love Number™?
This is in the spirit of the What is a Word/Phrase™ series started by JLee with Number version puzzles.
If a number conforms to a special rule, I call it a Hope & Love Number™.
Use the following ...
- 5,621
9
votes
3
answers
330
views
Know your primes
Did you know that a prime, regardless of its base, is always a prime?
I am looking for a prime. It’s the largest of its kind.
In solving this puzzle, the answer you may find.
...
- 2,341
6
votes
1
answer
217
views
Bravetart: Iconic America
It's been a while since I've posted, and in the spirit of my recent works, I've got a simple riddle to get back into the swing of things. As always, I hope you enjoy it, and best of luck!
After the ...
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1
vote
0
answers
259
views
Two-column table of numbers from a geocaching site
I found this table, but can't seem to find any relation between the numbers. Also there is not much logic involved.
2002
13
1987
11
1984
5
1998
6
2004
22
1999
12
????
??
A table with numbers. ...
- 11
0
votes
1
answer
419
views
What is the missing number in the box
I found some online number puzzle as below:
My guess was 436 (go up by 118 again, as the left & right go up by 1) but apparently it was incorrect. I cannot see any other patterns, any ideas?
- 475
7
votes
1
answer
274
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I'm a Proper Divisor
Ann and Bob are playing a number game. Ann starts with the number 60. Then she subtracts a proper divisor of 60 from it. Bob then takes the number Ann made and subtracts one of its proper divisors ...
- 2,305
14
votes
3
answers
716
views
Hiker's Cabin Mystery | Pt. II
See Part I | See Part III
Nice one, @GarethMcCaughan!
Finally, you've gotten into his computer using the password you managed to decode from his clues... but there's another issue! There is a ...
- 3,111
10
votes
1
answer
603
views
I'm thinking of a number
The unusual thing about this number is that the most common phrases that use it are wrong. That is, while someone may often say there are X As in a B, the actual number is not X.
What number am I ...
- 4,883
9
votes
1
answer
174
views
What's the significance of this pattern?
Note, this is my first submission, let me know if I broke the rules.
What is the significance of the following sequence of # signs?
...
4
votes
5
answers
440
views
Haters will say 28 June
Find the next number in this sequence:
$4,3,7,5,10,15,?$
Think outside the frustum here.
Hint 1:
Hint 2:
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9
votes
8
answers
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What mysterious whole number am I?
From my second point of view I copy that amount of first.
I am the dominant side of two but for many I'm the worst.
I'll be tricky to find but today might be your day,
after all my neighbour is 2/3 of ...
- 2,897
9
votes
2
answers
2k
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Ten-digit number that satisfy divisibilty rules for 2,3,4,5,6,7,8,9,10&11
Question:
Arrange the digits 1,2,3,4,5,6,7,8,9,0 to make a ten-digit Number that satisfies all of the divisibility rules for 2,3,4,5,6,8,9,10,&11. BONUS: make the number also divisible by 7
- 101
5
votes
2
answers
304
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Using 20, 17, 16, 8, 7 to make 9
You can use $+, -, \times, $ or $/$ (namely $\div$).
Use all five numbers (20, 17, 16, 8, and 7) only once to make $9$.
From what I've been told there are $4$ answers. The only one I've been able ...
- 53
8
votes
4
answers
1k
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A "Find the Path" Puzzle
I invented a puzzle, inspired by Simon Tatham's Portable Puzzle Collection. Is there anything that it could improve on? Was it too easy, or was it too hard? Anything I could add? What must I call it?
...
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5
votes
8
answers
617
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Make $1,\dots,15$ using $3, 9, 9, 9$
This was inspired by many puzzles that use three/four numbers to create other numbers. I chose these numbers in particular because of this post.
Can you find a way to make all the natural numbers ...
- 6,682
8
votes
2
answers
269
views
Half and Double Value
A 3 year old child tried to input or copy a number (written on the paper) to a calculator but he messed up with the digit places. All the digits are there but the value of the number he inputed ...
- 6,626
13
votes
1
answer
382
views
What is a Voluminous Number™?
In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles.
If a number conforms to a special rule, I call it a Voluminous Number™.
Use the ...
- 1,515
2
votes
3
answers
512
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72 + 96 = 120, is it possible?
I came across the following riddle:
How is it possible for $72+96=120$ to be correct?
- 216
4
votes
1
answer
255
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systematic number removal [duplicate]
The whole, natural numbers 1 through 50 are written on a board. The following operation is performed 49 times: select any two of the numbers on the board and write the absolute value of their ...
- 337
17
votes
3
answers
7k
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Which two students spoke wrongly? [duplicate]
A teacher wrote a large number on the board and asked the students to tell about the divisors of the number one by one.
The 1st student said, "The number is divisible by 2."
The 2nd student said, "...
- 1,101
6
votes
1
answer
258
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What do numbers have?
Numbers 0 through 9 each have a number of something.
0 has 6.
1 has 2.
2 has 5.
3 has 5.
4 has 4.
How many do 5, 6, 7, 8 and 9 have?
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2
answers
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What is a RAP Number™?
Taking inspiration from "What is the word™" series, here the numbers conforms to a special rule, I call it a RAP number™.
Use the following examples below to find the rule.
RAP number™
NOT ...
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