Questions tagged [sequence]

A puzzle about a series or collection of symbols, elements, or other objects, whose chosen ordering obeys a specific logical rule, which is usually to be determined.

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1 answer
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Few enigmatic puzzles [closed]

?, 63264, 12825, 65121, 02420, 48409 REDYPS, Y = ? 8, 33, 5 : X, II, ? Gods in space (7 letters) = 51151 = 8812, 22334 = 8459, 99111 = 2110910, 27772 = ?
IdontKnowWhatNameToPut's user avatar
4 votes
2 answers
326 views

Sequence of 3x3 grids of dots

Has anyone got any ideas on how to go about solving this?
Redditposter's user avatar
9 votes
3 answers
862 views

Minimum number of flips needed to fully set a binary string

Source: My school teacher, it was just given as a problem statement. Problem: You are given a binary sequence $S$ of up to $10^6$ bits. You wish to set all the bits in the string to $1$, but the catch ...
user88178's user avatar
  • 103
4 votes
1 answer
725 views

Numbers turned into a number turned into numbers (start with the smallest)

What number should replace the question mark? Explain why. Hint 1
Prim3numbah's user avatar
  • 32.4k
4 votes
2 answers
190 views

Strings of Kind Numbers

A positive integer is said to be “kind" if it is divisible by one of its digits other than 1 (https://oeis.org/A185186). A kind string of numbers is a finite sequence of numbers all of whose ...
Bernardo Recamán Santos's user avatar
4 votes
0 answers
297 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?
Alan Bagel's user avatar
19 votes
1 answer
520 views

Almighty threats!

There's rhyme and reason behind the following 10-step sequence of words and phrases: 1. HUSK 2. BE COMELY 3. TRACKED 4. NOT HOOK 5. KICK TIPS 6. CUSP 7. ALMIGHTY 8. THREATS 9. BEFIT 10. ? The name ...
Stiv's user avatar
  • 138k
12 votes
2 answers
631 views

Arithmetic-progression-free sequences

This question Sudokus with no 3-term arithmetic progressions within made me wonder about the following question. What is the longest sequence composed of the integers 1..N (or 0..N-1 if you have a ...
Florian F's user avatar
  • 28.4k
2 votes
0 answers
113 views

Find another way to prove the answer: circles with four numbers in them [closed]

I know of an alternate solution to 3 where trying to find it would make an interesting puzzle. Can anyone do so? It has to involve a sequence somehow. Source: https://www.indiabix.com/puzzles/number-...
Indias puzzle girl's user avatar
2 votes
1 answer
294 views

Number sequence puzzle: strings of 0s and 1s

How can I solve this sequence? 011010, 100010, 100010, 100010, 000010, ?, 100010 https://free.ultimaiq.net/nse.htm
Simi 's user avatar
  • 23
2 votes
0 answers
298 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, ...
Ruleft's user avatar
  • 29
0 votes
1 answer
143 views

Sequence of triangles divided into 10 smaller triangles with yellow, purple, and/or dots [closed]

This is IQ type of puzzle. May not be progressive sequence.
Fraternal9274's user avatar
1 vote
2 answers
261 views

Numeric progressive matrix: 2-7-5, 2-3-4, 10-21-?

This is an interesting question that I got from an IQ interview test. This can have multiple answers but need a good explanation.
Chau Giang's user avatar
8 votes
2 answers
827 views

A very presentable number sequence

(The title holds a clue) 12,22,30,36,40,42,42,40… Here is a finite sequence. Can you tell me the sum of all of its numbers?
PDT's user avatar
  • 9,888
8 votes
1 answer
518 views

Find the pattern of the sequence of prime numbers 17 23 5 1013 2027 13

A friend gave me a sequence of prime numbers 17 23 5 1013 2027 13 and said that they have a pattern. I tried to find something but I am stumped by the fact that the numbers first increase, then kill, ...
whoisthat's user avatar
5 votes
1 answer
300 views

What are the next 3 terms: 19, 43, 59, ...?

What are the next 3 terms in the following finite sequence? 19, 43, 59, 23, 79, 83, 109, 463, 569, 263, ?, ?, ?
Dmitry Kamenetsky's user avatar
9 votes
1 answer
485 views

none, none, Newland, Portage, Plano

What is the pattern behind this list of US cities? Really quite simple for US folk, and I think most educated foreigners have the requisite background info. US City US State Añasco PR Carolina PR ...
Laska's user avatar
  • 1,909
19 votes
1 answer
2k views

Can One Solve This Scary Sequence?

The following terms appear in a sequence. Unfortunately, they are scrambled (both the original terms and their order). Theory, Policeman?, Contest, Clarice, Bad Act, One in Rome, Fashionable, Confess,...
AlteringIntegral's user avatar
1 vote
5 answers
2k views

What is next letter in sequence: B, D, G, J, L, ___?

My answer is P. But I am not sure as there is not sufficient data to support this. B(2), ____, G(7), ____, L(12), _____ (alternating sequence of difference 5: 2, 7, 12, 17,...) ____, D(4), ____, J(10),...
Mohit Vijay's user avatar
5 votes
0 answers
251 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(...
popcorn's user avatar
  • 51
5 votes
1 answer
578 views

What is the next number in the following sequence: 0, 4, 8, 21, 52, 65, 96,?

What is the next number in the following sequence: 0, 4, 8, 21, 52, 65, 96, ? To allow new users to solve this puzzle and earn reputation points, I encourage all users whose reputation is 200 or ...
Will Octagon Gibson's user avatar
15 votes
1 answer
894 views

E Rebus Unum – a picture sequence puzzle

This is part 42 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, Today I have been taking it easy. You might even say it has been a walk in the ...
Jafe's user avatar
  • 77.8k
6 votes
1 answer
499 views

A healthy number sequence

What should b the missing number? 1, 2, 3, 5, 6, 7, ?, 12
Dmitry Kamenetsky's user avatar
3 votes
0 answers
150 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: ...
Aitzaz Imtiaz's user avatar
2 votes
1 answer
958 views

What is the next term in the sequence 3, 1, -7, 41?

I could detect only one pattern, however, the sign is confusing me $3 - 1 = 1 \times 2$ $1 - (-7) = 2 \times 2^2$ $-7 - 41 = -3 \times 2^4$ I have a pattern, but I am confused due the to sign.
Mohit Vijay's user avatar
2 votes
3 answers
336 views

Next term in sequence [closed]

Came across these 3 sequences to find the next number denoted by '?' in a test yesterday and was unable to select the right answer from the options given 1,6,19,54,151,426,? - Options given are 1415,...
quantrader23's user avatar
9 votes
1 answer
195 views

Continue the squence of hexagons

This is from c't, a German IT magazine (link will download file). You see seven hexagons, each with seven green and blue dots, following a specific rule. Find out what colors the circles must have to ...
Mighty4711's user avatar
7 votes
1 answer
416 views

Explain: 5-1=1, 5+1=1, 5=1

Explain the following equations. The final answer is 1 word. $4 ÷ 7 - 1 = 0\\ 1 \times 12 + 8 = 2\\ 0 ÷ 10 + 7 = 0\\ 9 \times 2 - 3 = 1\\ 5 - 1 = 1\\ 4 - 2 = 1\\ 2 \times 2 - 9 = 1\\ 5 = 1\\ 5 + 1 = ...
Lezzup's user avatar
  • 4,906
8 votes
1 answer
515 views

What comes next in this sequence? Choose from 4 options

What comes next in this sequence? Why? Choose from the 4 options.
RogerA's user avatar
  • 6,049
16 votes
2 answers
1k views

What should we put in the 6th box?

Below there is a small sequence. What should we put in the 6th box?
Lezzup's user avatar
  • 4,906
4 votes
1 answer
442 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 ...
user85272's user avatar
-4 votes
2 answers
417 views

4, 2, 4, 2305843009213693952, ? - an original number sequence

Here is the sequence: 4, 2, 4, 2305843009213693952, ? Source: My brain (as it was invented by me. I also attempted to search if someone else created this, but I was unable to find) Hint 1: Hint 2: (...
Qaer Kyr's user avatar
3 votes
1 answer
134 views

Find the next term in the sequence [closed]

What's the next term in the sequence? $12$, $28$, $36$, $84$, $88$, $168$, $\ldots$ The possible choices are: $174$, $170{2\over3}$, $188$, $169{1\over3}$, $176$
user85175's user avatar
1 vote
3 answers
381 views

The following sequence contains a 12 somewhere

Consider the following sequence: 11, 6, 11, 11, 6, 11, 11, 6, 11, 6, 6, 11, 6, 11, 11, ... Although it looks like a sequence of 6s and 11s at first, it will in fact eventually contain a 12. Also, it ...
Geoffrey Trang's user avatar
9 votes
1 answer
350 views

A *special* sequence of dots and lines (from first to last)

What you see here is a complete sequence of dots and lines. Can you tell me what this sequence represents?
Prim3numbah's user avatar
  • 32.4k
0 votes
1 answer
481 views

Circle, circle + triangle, ... sequence of groups of colored shapes:

Source: https://ravens-2-progressive-matrices-clinical-edition.netlify.app/ I can't seem to find a logical consistency for the answers. What is the correct answer?
Halcyon Abraham Ramirez's user avatar
5 votes
1 answer
391 views

Why do 1 and 1 complete 120, 10, 3, ?,?

This is a question from an IQ test (NSE test designed by Ivan Ivec and Theodosis Prousalis). The link for this test is https://free.ultimaiq.net/nse.htm The sequence is: 120, 10, 3, ?, ? The answer ...
Von's user avatar
  • 59
10 votes
1 answer
551 views

Form the English alphabet using thirteen people

Thirteen well known people (some of them alive and some of them deceased) are numbered from 1 to 13. Instead of revealing who they are, the following clues are provided: An Italian football player. ...
chandanr777 's user avatar
16 votes
1 answer
2k views

This won't work with US states

This puzzle is part of the Monthly Topic Challenge #12: mobile-friendly puzzles. For each of the following sequences, identify the three missing terms (marked by '???'): Nitrogen, Fluorine, Argon, ...
Stiv's user avatar
  • 138k
4 votes
1 answer
425 views

Find the next digit in four given sequences

Find the next digit in each of these four sequences: 7 8 8 8 8 ... 3 4 5 2 5 ... 2 1 2 1 2 ... 1 1 9 6 3 ...
David's user avatar
  • 738
1 vote
1 answer
342 views

Restore a once very happy sequence

Once, I had a nice sequence of numbers.. They were all very happy. Suddenly, someone came by and stole all the lines. The numbers didn't know what to do, and got very scared. They clung to each other. ...
Lezzup's user avatar
  • 4,906
2 votes
1 answer
209 views

What are the next 2 letters in the sequence: B, U, C, S, D, R, ?,? [closed]

B, U, C, S, D, R, ?, ? The above sequence is provided and we should guess the next 2 letters. The next letter could possibly be E, but what about after that?
newbie's user avatar
  • 21
10 votes
1 answer
906 views

How is the RHS related to the LHS

Please explain the following relationship: Accessible: 2 --> 18 20 --> 48 200 --> 6 2000 --> 26 How did I arrive at these?
RogerA's user avatar
  • 6,049
-5 votes
2 answers
138 views

An interesting Number sequence: 8, 10, 7, ...? [closed]

Let's see how many of you can solve this correctly I found a number sequence puzzle somewhere in the web with interesting logic and a unique strict solution. 8, 10, 7, 12, 5, 16, 3, ?
Guest user's user avatar
1 vote
1 answer
169 views

Continue the row of numbers: 1, 3, 9, 13, 65, ...?

Yesterday, I stumbled across a series of numbers that I could not solve. Maybe one of you can figure it out? 1, 3, 9, 13, 65, …?
HeterPawker's user avatar
21 votes
1 answer
920 views

rectangles gone black

Based on the sequence of rectangles you see below, which rectangle (A-E) should replace the question mark? Once you figure out what this puzzle is all about you'll know which of the five should ...
Prim3numbah's user avatar
  • 32.4k
3 votes
1 answer
319 views

You may need a dictionary

Can you find the missing words (number of question marks equal number of letters) puzzling - puzzled - perplexed - ??????? - ???????? - ??????? - ????????? - ?????????? - ?????????? - ??????? using ...
poco's user avatar
  • 2,198
6 votes
1 answer
948 views

Given the length of sequences with different seed values, what comes next? 1, 2, 4, 5, 11, 22, etc

Edit: Apparently this site has had a few too many what comes next puzzles without anything to go off of so I've decided to make this a different albeit a bit easier puzzle. Sequences generated by a ...
MilesZew's user avatar
  • 699
3 votes
1 answer
550 views

1, 2, 3, 10, ... Another find-the-next-number-in-the-sequence puzzle

Can you spot the pattern and continue the following sequence? 1, 2, 3, 10, 12, 16, 25, 37, 55, 81, 100, ... Hints:
Dennis_E's user avatar
  • 1,209
21 votes
1 answer
2k views

Only Connect - all at once!

This puzzle is part of the Monthly Topic Challenge #9: Game/Quiz Shows. Did you see the glitch on Only Connect last Monday?* The one where all four of the rounds got merged into one?! Effectively, ...
Stiv's user avatar
  • 138k

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