Questions tagged [number-sequence]

A puzzle that asks for the pattern in a given number sequence.

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11
votes
2answers
138 views

Look at me - a number sequence

This sequence goes on forever, but here is the first 7 of them. The X's are just there to hide the actual digits. Can you find all the correct digits of the 8th entry? 1024, 90X1X, 25023X, 490364, ...
11
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3answers
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The Woman and Bird in the Night: Can you solve the riddle related to this painting?

At my school we have this thing called the breakout box and there's a challenge. It's pretty hard, so me and some of my friends have been working on it. The idea is that there is a box with a bunch of ...
10
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4answers
3k views

Solve this number sequence: 20, 21, 21, 22, 12,?

Can you find the last number of this sequence; it may require a bit of a leap? 20, 21, 21, 22, 12, ? Hint 1: Hint 2:
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4answers
1k views

Five sequence puzzles

The following five sequence puzzles are quite nasty and hard to solve. Yet, each of them has a clear and justifiable solution. Sequence 1: ?, ?, ?, B, B, C, ?, ?, F, ?, S, M, A, S, P, S, C, A, .....
10
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2answers
2k views

Seeing the forest for the trees and all that jazz

No math involved here, just a bit of lateral thinking. Can you figure out what comes next? 2, 4, 8, 4, 4, 1, 3, 2, 7, 8, 3, 3, 6, 3, 4, 5... Bonus: How about here? 6, 3, 6, 3, 3, 5, 3, 3, 4...
10
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5answers
2k views

Aces, twos, threes, and fours in a row

Take the 4 aces, 4 twos, 4 threes, and 4 fours from an ordinary deck of playing cards. Is it possible to place all 16 cards in a row on a table so that there is precisely 1 card between any 2 ...
10
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4answers
407 views

This number sequence has entered my life recently

Just recently, I've noticed this sequence of numbers has become a pretty big part of my life. It goes like this: 1, 2, 4, 6, 9, 12 So here's the mystery: What is this sequence? Where do I keep seeing ...
10
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6answers
662 views

Temple Password

You and your friends Brutus and April are exploring an ancient temple when you encounter a locked door with a stone keypad next to it numbering 0, 1, 2 and 3. Out of curiosity you decide to type in ...
10
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4answers
779 views

How to deal with Tim

My friend Tim is a real dick. Whatever happens to him he just won't die! I asked him what the secret to his power was (So I could kick his ass). He handed me a crumpled up piece of this paper with ...
10
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1answer
2k views

Which two numbers replaces the question mark?

I was solving some number puzzles. I am finding difficulty in solving this puzzle: which two numbers will replace the question marks? I need answer with explanation.
10
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1answer
1k views

The end of the life!

$1\ 16 \ 41 \ 55 \ 79 \ 90 \ 103 \ 120 \ 123 \ ?$ What is the last number in this different sequence! If you find it, it will be the end of the life!
10
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2answers
962 views

Somebody hacked my clock

Harvey the hacker hacked my clock. At first, the results made no sense, but I eventually figured out his logic. ...
10
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6answers
852 views

A Game Of Cat And Mouse: Part 2

Part 1 can be found here. Information from Part 1 is not required to solve this puzzle. Having identified where El Gato intends to strike next, you charter one of the Bureau's jets and fly off to ...
10
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3answers
566 views

Two missing numbers

Two numbers go at the $?$s, what are they and why? $733,\space \space 716,\space \space 645,\space \space 565,\space \space 324,\space \space 276,\space \space 77,\space \space 75,\space \space 64,\...
10
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1answer
518 views

Find the missing properties of cyclic number

Guess a 6 digits number in the form of $\ abcdef$ which holds Properties #1, #2 and #3. The real challenge is to find 4 other interesting properties of this number: Property #1 $\ a+d=b+e=c+f=9 $ $\...
10
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1answer
399 views

Unambiguously Questionable Numbers

The examples below are considered Unambiguously Questionable Numbers: 8 to 7 is 8 23 to 22 is 5 628 to 626 is 2 3969 to 3943 is 3 7712 to 7701 is 9 19824 to 19823 is 5 19897 to 19870 is ...
10
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1answer
763 views

Continue the sequence

So my last riddle turned out to be too easy. Lets see if this one is difficult enough. You wake up with a huge headache and look around you. Somehow you managed to end up in a white room of about 2 ...
10
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2answers
382 views

What are the next three numbers in this sequence?

What are the next three numbers in this sequence, and why? 110, 150, 230, 350, 550, 910, 1510, 2510... Hint 1: here's another sequence that follows identical rules. Hint 2: here's a third ...
10
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2answers
641 views

Three in a lock

In the 1980s, a German spy was assigned a mission to retrieve a set of important documents kept inside a British outpost. The spy knew that the documents were locked in a safe, which the password was ...
10
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1answer
441 views

Given these numbers, find the hidden word

Given this sorted list of 33 numbers, is it in your power to find the riddle they are hiding and figure out the secret word? ...
10
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1answer
604 views

A “simple” number sequence puzzle

What are the last three numbers in this sequence? 6, 8, 92, 88, 32, 53, 106, 88, 6, 63, 60, 68, 15, 75, 16, ___, ___, ___ This is not an OEIS sequence, nor does solving it require any math.
10
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1answer
414 views

Sequence dependent on my place

I currently stand on point A, somewhere in Europe. When I do my sequence here and if I start with 25, I get the following sequence: 25, 13, 7, 5, 4, 4, 4, 4, x, ... When I step a few metres to ...
10
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1answer
310 views

What is the next number in the sequence 0,0,16,28,77,144,264?

0,0,16,28,77,132,264 What is the next number in the sequence? Note: This sequence is not found on OEIS
10
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1answer
223 views

Enigma between Colleagues (Part1)

With a colleague, we tried to create enigma to challenge ourselves. Here is our first try, hope you will enjoy it. 4 = 2 12 = 3 19 = 3 24 = 4 47 = 5 50 = ? Hint 1 : Don't hesitate to comment some ...
10
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1answer
265 views

The music of the heavens

A monastery has a curious practice: they call it the music of the heavens. The monks cycle through a cave with cups, to a stalactite at the center, which drips water. But this is not a steady ...
10
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1answer
472 views

A Philosophical Sequence

What is the next number in this (almost certainly infinite) number sequence? $23, 2, 1, 11, 37, 4, 7, 15, 8, 66, 48, 31, 202, 84, 49, 173, 23, 42, 167, 69, 147, 97, ?$ (Here's a helpful link for ...
9
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1answer
800 views

Calling all number sequence lovers!

What number follows in this sequence 93 1 855 45 593 500 241 ?
9
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1answer
760 views

A sequence about you (Puzzling Stack Exchange users)

I have a mysterious sequence for you... $204, 186, 172, 133, 126, 123, 120, 119, 111, 107, 102, 96, 90, 87, 86, 86, 85, 79, 75, 73, 70, 68, 66, 66, 65, 65, 65, 64, 64, 64, ...$ This sequence may ...
9
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1answer
206 views

Figure It Out With Ease

What goes next in the number sequence? 9, 9, 10, 9, 10, 9, 9, 9, 5, 8, 6, 10, 11, 8, ? Hint 1 Hint 2
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2answers
2k views

What is the next term in the sequence?

The first term is f(0), the last term is f(2000): 0,0,0,0,1,0,1,0,2,1,1,0,2,0,1,1,3,0,2,0,2,1,1,0,3,1,1,2,2,0,2,0,4,1,1,1,3,0,1,1,5,0,2,0,2,2,1,0,4,1,2,1,2,0,3,1,5,1,1,0,3,0,1,2,6,1,2,0,2,1,2,0,4,0,1,...
9
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1answer
306 views

The Very Model of a Number Sequence

Number sequence questions are normally not received well here but I thought this one might warrant a bit more attention as it has the following interesting properties: It is a finite sequence. ...
9
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1answer
331 views

A game with numbered cards

Alice and Bob have each a number (not greater than 30) of cards numbered sequentially 1 onwards. Alice can easily reorder her cards and place them on a table one after the other so that no two cards ...
9
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1answer
353 views

Sequence seen on the street

I was walking on the street when I saw the following numbers: $0, 7, 2, 3, 9$ The sequence continued a bit further then looped back. However, it was not the sequence I was expecting, so it took me ...
9
votes
1answer
346 views

Bidimensional number sequence

The numbers below have been generated using a (quite) simple algorithm. Can you spot the pattern and deduce the numbers in the next column and row? $$ \begin{matrix} 1 & 2 & 2 & 4 & ...
9
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5answers
2k views

Another one of those odd sequence puzzles

This is an interesting one. I will do the same thing that I usually do. After one week, a hint. After 2 weeks, a hint. After 3 weeks, an answer. I may change this system. What number goes in the ...
9
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1answer
311 views

Replace ? by number

This chain of numbers is making confused.Help to find the answer with explanation.
9
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4answers
560 views

Difficult number sequence

33, 66, ?, 1212, ?, 1218 I just can't figure out how to complete this sequence. The last number throws off everything I try. Anyone have some ideas? I can perhaps see the missing numbers ending in 9 ...
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2answers
2k views

A poem and a number sequence

You wake up on the floor of an empty room without having any recollection of how you got there. The room is very dimly lit and it takes a while before your eyes are adapted to the darkness. There is ...
9
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2answers
278 views

Number Patterns

Your mission, if you choose to accept it, is three parts: A) Figure out the pattern; B) Give an eleven-number sequence beginning with 2 that follows the same pattern; and C) Give an eleven-letter ...
9
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1answer
571 views

This is another number sequence puzzle!

Can you find the next number in the following sequence: 3, 6, 9, 8, 13, 20, 17, 14, 21, ? If you're operating differently you probably prefer to solve the following sequence: 2, 0, 0, 12, 35, ...
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5answers
668 views

The Legend of Four

As far as I know, all numbers have a root of 4. What I mean by this is as follows: Starting with any number, for example 384, I take the number of letters in that number. Then I repeat this process ...
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3answers
2k views

What is the next number in sequence and why?

What is the next number in sequence and why? 7, 8, 5, 5, 3, 4, ...
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6answers
2k views

A mosquito is born at T=0 and after 2 seconds makes a new mosquito every second, how many mosquitos at T=8.5? [closed]

One mosquito is born at T=0 and after 2 seconds it makes a new mosquito, and another every second thereafter. All such mosquitoes have this same property and do not die. How many mosquitoes there are ...
8
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3answers
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 ...
8
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4answers
1k views

A crypto-sequence puzzle

Your Japanese co-worker from this problem hands you another piece of paper one day: 1820143 2383341 3245353 8425463 6354607 6627972 9088779 7839589 ??????? ??????? What two seven-digit ...
8
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5answers
2k views

A tricky batch of four number sequences

What are the next few numbers in each of these integer sequences? Each of them has a clear and justifiable solution. 1, 2, 3, 5, 8, 9, 12, 20, 21, 22, ??, ??, ... 50, 49, 48, 46, 45, 44, 43, 38, ..., ...
8
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1answer
1k views

What is the next number in the sequence?

What is the next number in the following sequence? 9999999, 4782969, 217728, 1568, ??? I saw this question in an app and I am stuck. Can you help me? Source: https://play.google.com/store/apps/...
8
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3answers
2k views

FBI number riddle

A friend sent me this riddle and I can't figure out a solution: January = 251017 February = 25628 March = 81335 April = 12145 May = 251353 June = 51064 July = 251074 August = 20186 ...
8
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2answers
303 views

Which are the missing dates?

Here are the dates for a series of events. As you can see, some of the dates are missing. What are the missing dates. And what happened at these dates? $~~~????,~ 1914,~ ????,~ 1939,~ 1958,~ ????,~...
8
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1answer
831 views

Where did I find these numbers?

I generated this number sequence by following a pattern. Can you determine that pattern? 1 120 10800 345600 3024000 15780000 220752000 Some rounding was used to get these numbers, so ...

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