Questions tagged [sequence]

A puzzle about sequences of symbols, elements, or other objects.

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13 votes
1 answer
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A strange number pattern, isn't it?

This looks like a strange number sequence to me. Or is it? 1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 20 21 22 23 24 25 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 ? ? ? ? ? So what are ...
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5 votes
1 answer
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Palindrome from the first 16 *roman* numbers

Can you concatenate the numbers from I to XVI in some order, such that the resulting 38-letter string is a palindrome? This puzzle was inspired by a recent puzzle by Dmitry Kamenetsky.
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11 votes
1 answer
307 views

Gah, these number sequences are just too boring!

Gah, these number sequences are just too boring! You just plug them in and then you're done! There is a function $f : \mathcal{S} \to \mathbb{Z}$, where $\mathcal{S}$ is a finite subset of the ...
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  • 483
2 votes
1 answer
74 views

What's the next symbol in the sequence below in the picture? [closed]

I was given this puzzle today and I'm completely stumped on what the missing symbol would be. Does anyone know what it is and can explain how they got it?
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6 votes
1 answer
189 views

A Simple Sequence (405, 360, 0...)

The answer is a relevant word; no computer needed Numbers are approximate 405, 360, 0, 180, 360, 270, 190, 360, 0, 0, 180… 405, 80, 190, 90, 360, 0
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1 vote
1 answer
137 views

What is next in the sequence of dot arrangements?

Given the 3 arrangements, identify the next in sequence. Reference: Book on Quantitative Ability and Puzzles for Competitive Exams, India. I have the correct answer, will edit the question once it ...
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0 votes
1 answer
334 views

What is this sequence? 1, 11, 21, 22211, 33221

In this sequence: 1, 11, 21, 22211, 33221, 433332211, 44444444332221, ? Can you guess the next number? What is this sequence? Hint 1: Hint 2:
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7 votes
1 answer
228 views

How do you go from 2021 to 2022?

Below a path is shown that goes from 2020 to 2021. Following the same path, how do you go from 2021 to 2022? 2322, 2302, 2012, 2020, 2028, 2025, 2024, 2029, 2021, ..., ..., ..., 2022 Fill the gap.
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2 votes
1 answer
272 views

Numbers, Racked Up

What does this list of numbers represent? 16 5 0 3 11 2 2 5 5 1 2 3 7 4 14 4 1 1 3 4 6 0 2 2 3 1
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  • 3,546
0 votes
2 answers
202 views

What should be the most logical and appropriate 9th term in this sequence?

Consider this sequence 3, 5, 10, 20, 39 What is the pattern? I initially thought it might be a pattern of *2-1, *2,*2,*2-1 (a group of *2-1,*2,*2 repeating itself), but don't think this is a valid ...
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  • 101
3 votes
1 answer
105 views

Very long number sequence

Here is the sequence: ...
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  • 137
3 votes
1 answer
258 views

Find the pattern in this encrypted sequence

Fill in the question mark in the sequence: tfgz, aqt, its, pxoii, xhfa, nlif, nxi, ezfzh, cqiob, ctcm, swyvyus, frifri, zpfhdz, bfkztlkk, mhztmbx, rzboekb, ? Hint 1: Hint 2:
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  • 137
9 votes
1 answer
390 views

Complete the rest of this seasonal sequence

Usually I don't like this kind of "guess the next terms" puzzle. But at this time of the year I wonder whether it makes sense to post such a question. So here is the start of a sequence: $$...
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0 votes
2 answers
409 views

Sequences on an IQ Test

I found this IQ test (http://free.ultimaiq.net/nse.htm) and can't seem to solve questions 18 and 19: Q18: 120, 10, 3, ?, ? Q19: 41, 23, 61, ?
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12 votes
2 answers
701 views

You don't want to sell me matchsticks

Fix the image before completing the sequence. What do I want you to draw your attention to? 103, 91, 79, 0, x, x, 28, x, x, x, 0, 78, x, x, x, x, x, x, 5 Hints:
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  • 5,862
2 votes
1 answer
126 views

Find the missing letter (Alphabet puzzle)

What letter replaces '?' in the stack? How do you arrive at it? Source: CSIR NET December 2018 QP
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3 votes
0 answers
201 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 ...
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  • 4,767
5 votes
1 answer
258 views

Find the missing letter in a well known sequence beginning with 80

Here is a well known sequence of 118 items, which begins with 80. Please find the missing letter. (marked by a ?) 39, 44, 68, 115, 10, 16, 23, 92, 1, 68, 85, 38, 95, 15, 22, 68, 92, ?, 16, 85, 86, 92,...
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  • 11.8k
5 votes
3 answers
326 views

Ever shrinking number sequence

Below is a list of number sequences which follow a specific rule from one to the next. The first seven sequences are written out already. Can you deduce the next one? ...
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11 votes
1 answer
1k views

Can you help James Bond find the next letter?

James Bond needs to hack into Le Chiffre's computer to prevent him from fulfilling his evil plan. All he needs to do is find the next letter in this sequence: H O T T S F F F S Question: Can you ...
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  • 1,397
10 votes
1 answer
240 views

A new charity hit single

There's a new charity hit single coming soon! 59 musical artists from the worlds of rap, hip-hop, pop, rock, musical theatre and country music have been working on a unique collaboration, performing a ...
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1 vote
0 answers
45 views

What is the missing term in this numerical sequence? [duplicate]

The missing term in this sequence has been replaced by the placeholder "—". What is the missing term, and why? 10000 121 100 — 24 22 20 17 16 15 14 13 12 11 10
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17 votes
1 answer
1k views

A week around Europe

I've recently returned from a week of travelling around Europe, visiting a different town or city in a different country on each day, choosing my destinations according to an underlying pattern. I've ...
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  • 93.7k
3 votes
1 answer
204 views

As simple as 1,2,3?

What is the next number in the sequence? 1, 2, 4, 3, 9, 5, 6, 10, 16, 7, 11, 8, 25, 12, 17, 13, 14, 18, 36, 15, 26, 19, 20, 21, 49, 27, 22, 23, 28, 37, 24, 29, 64, 30, 31, 38, 32, 33, 50, 39, 81, 34, ...
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  • 1,044
5 votes
2 answers
2k views

What comes next in this sequence? 2, 3, 1, 5, 7, …

Here's a sequence I can't solve. It includes every number from 1-14, does not include 15 and 16, and then has a 17. I think there may be a pattern in natural number progression but can't find it. What ...
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14 votes
2 answers
2k views

Modification of 100 lightbulbs problem (everyone flips 100 bulbs each)

This is a modification to the usual 100 lightbulbs in a room puzzle. Like before, the first person flips the switch of every lightbulb. However, while the second person also starts from the first ...
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  • 309
12 votes
1 answer
412 views

Circling the rectangle: A strange IQ problem

I'm sure you're all familiar with pattern recognition puzzles where you have to find the next picture in a sequence. Well, I’m completely stumped on this one… Can you help? There is a sequence of ...
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  • 5,253
6 votes
2 answers
505 views

What kind of sequence is this?

Start with 1 1 1 2 1 2 1 1 8 2 1 2 8 ? Your answer should explain what these numbers represent. Hint 1: Hint 2: Hint 3
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  • 38.8k
1 vote
0 answers
143 views

I need help deciphering what looks like a binary message

I was watching a YouTube video and it’s filled with secret messages and codes. The last two codes were in binary and inserting them into a translator provided correct answers. However, that's not ...
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  • 11
14 votes
1 answer
740 views

We Need to Extract Frank’s Site Rankings

I asked my friend Frank to rank his favorite Stack Exchange sites from 1 (favorite) to 10 (least favorite). This is the feedback he left, but I got them a little mixed up and don’t know which he ...
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3 votes
4 answers
515 views

Which come next in these visual logic sequences? [closed]

I took these puzzles from Jim Barrett's book How to Pass Advance Aptitude Tests. I found this bunch not that obvious to answer. Can you help me find the right choice for each sequence and explain your ...
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2 votes
2 answers
1k views

What number comes next in 2, 4, 5, 3, 10, …

2, 4, 5, 3, 10, 11, 13, 7, 5, 28, 29, 31, 35, ??? I tried plugging it into Wolfram Alpha which couldn't find any pattern, and I'm still not too sure how to determine what number comes next. Any ideas?...
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  • 121
6 votes
2 answers
1k views

I need another shape 💠

Given the pattern above, which shape is next, and why?
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16 votes
1 answer
703 views

You can count on Sergeant Sequence

"Ah, Sequence, there you are," said the Chief Investigator as Sergeant Sequence entered the briefing room. "Your man Patrick Terne is on the move again, and we need your help to track ...
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  • 93.7k
24 votes
1 answer
1k views

A predictable sequence

"Four, four, four, ..." droned the random number generating monster. "Are you sure that's random?" I asked. "That's the problem with randomness, you can never be sure!" ...
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  • 1,611
0 votes
0 answers
579 views

What is the next term in QOP, UYR, TRT, GHV?

What is the next term in the sequence: QOP, UYR, TRT, GHV? The choices are: A. TMY B. UYT C. UUT D. MNO The question is from an MDCAT sample test. I don't know the answer or how to get to it.
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-2 votes
3 answers
166 views

Sequence with all terms divisible by 8

Let's have the following infinite sequence 3968, 13224, 30624, 59048, ? What is the next term, replacing the question mark? Why are all the terms of this infinite sequence divisible by 8?
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0 votes
1 answer
102 views

Mount Olympics?

A friend sent me the following sequence of numbers with the above title. They said it took them, and their friend wiki, 37 summers to frame it. 83, 55, 45, 44, 37, 36, 48, 46, 46, __ Can you help me ...
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  • 548
14 votes
1 answer
1k views

A Harry Potter sequence puzzle

What is the next term in the following sequence based on Harry Potter? None, 16, None, 16, 5, 9, ?
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  • 2,438
1 vote
2 answers
315 views

Colorful Puzzle

This puzzle is based on the squares before the one that says, "what color is this?". This is a sequence of squares, try to follow the rule(s) for the puzzle. Can you solve it?
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3 votes
2 answers
313 views

Colorful Pattern Puzzle with Arrows and Warning Signs

This is my first time on Puzzling Stack Exchange. I challenge you to solve this puzzle I made, impossible to everyone else except for me as far as I know. Can you solve it?
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1 vote
2 answers
172 views

Numbers sequencing and decoding... (#1)

Part 1: Q1,E2,T3,U4,O5,A6,D7,___ Find ___. Clue: draobyek Part 2: ode coded math is slogan done bans were math eroded question: eco desperate minus 14362 i22096 up ____ down. eulc? Clue: Word sin ...
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6 votes
1 answer
765 views

What's the last number in my wordy number sequence?

I have a wordy number sequence, partially shown below: $ {1, 45.2548, 1262.6650, 32768, 390625, 10077696, 282475249, 3037000499.976, 31381059609, ... }$ Can you find the last number in the sequence? ...
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  • 1,126
21 votes
1 answer
1k views

A Sequence That Keeps Changing?

So I get this special sequence of "items" as the following: 2 1 3 4 7 8 2 5 2 3 9 But look! If I put some numbers (randomly) in front of the sequence: 3 4 2 1 3 4 7 8 2 5 2 3 8 And yeah! ...
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  • 33.6k
5 votes
0 answers
209 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 ...
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2 votes
2 answers
426 views

Find the next number: 1, 9, 19, 30, 41.5,?

What is the next number in the list, and what is the secret formula for this list? 1, 9, 19, 30, 41.5, ?
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1 vote
0 answers
121 views

Sequence of rectangles/circles with blue lines (straight/zigzag) and small red triangles/circles inside [closed]

I saw this question in an IQ test, but I have no idea after thinking for very long time.
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3 votes
2 answers
211 views

Square sequence puzzle 3

Find what comes next in the following sequence: 1,4,9,6,0,8,8,8,8,0,2,6,0,0,? Bonus 1: What is the rule? Bonus 2:
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  • 137
3 votes
1 answer
211 views

Square sequence puzzle two

Find what comes next in the following sequence: 0,1,4,9,7,7,9,13,10,9,1,? Bonus: What is the rule?
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  • 137
-4 votes
2 answers
135 views

Square sequence puzzle

Find what comes next in the following sequence. 01, 04, 09, 16, 25, 36, 49, 64, 81, 00, 21, 44, 69, 96, 25, ? Bonus: What is the rule of the sequence?
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