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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 vote
1 answer
208 views

Number Sequence: 1, 1, 2, 4, 3, 9, 4, 61, ...?

Forgive me for the unoriginal title, it's been a while since I made a puzzle. Just a simple number sequence, find X and give reasoning/pattern 1, 1, 2, 4, 3, 9, 4, 61, 5, 52, 6, 63, 7, 94, 8, X ...
2 votes
1 answer
75 views

Number sequence puzzle: 14, 32, 69, 05,?

I made this puzzle on my own, feel free to solve it. Sequence is as follows: 14, 32, 69, 05, ?
22 votes
1 answer
1k views

Mind your P's & Q's

Here is a numbered sequence of words/phrases. Where should SESQUIPEDALIAN (or the title) fit in this list? ZIPPER PEPPER MONEY SNIPPY PRIMED PIPPED SNAPPED POUND PUPPY PARADROPPED QUASI-POPULAR ...
-1 votes
1 answer
149 views

Numerical sequence 942, 138, 424,?

Homemade number sequence puzzle, quite easy. Sequence: 942, 138, 424, ?
3 votes
1 answer
183 views

What's the image it all started with?

Below is a small sequence, showing every element, except the first. What is the image it all started with? text version: , ,r,r,r, , , ,g,g,g, , ,r, , , ,r, ,g,r,r,r,g, , ,g,g,g, , ,r, , , ,r, ,g,r,...
5 votes
3 answers
538 views

Sequence of 3x3 grids of dots

Has anyone got any ideas on how to go about solving this?
8 votes
2 answers
432 views

I’m cheering them on!

1: 3: 5: Can you determine what’s next? Clarification: In a comment I was asked if the [knowledge] tag should be added to this puzzle: Since no special knowledge is necessary to solve this puzzle,...
3 votes
1 answer
295 views

Number salad with a meaning

617181419920141 128131119 1331152419 54141131811 Your goal is to explain what number sequence should come next and what it means.
0 votes
1 answer
254 views

Numerical sequence puzzle: 552175, 228496, 198479, 583317, 140554, 114383, 117045, ?,?

So here's the sequence, that I composed on my own. Think trees and 🟡 : 🟡 552175, 228496, 198479, 583317, 140554, 114419, 117046, ?, ?
2 votes
0 answers
111 views

Continuing the hexadecimal sequence 9bf66a6a87, 9bfd91c857, 9c0501e2ae, 9c0991af27, 9c0d27e6ec, [closed]

Given the following sequence of hexadecimals, figure out how to generate the next few in the sequence: 9bf66a6a87 9bfd91c857 9c0501e2ae 9c0991af27 9c0d27e6ec My ...
-1 votes
4 answers
1k 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, ?
9 votes
1 answer
838 views

2,6,?,30,-270 number sequence

Got this number sequence puzzle from a friend.
-1 votes
1 answer
115 views

Numerical Sequence Puzzle: 8388607, 536870911, 2147483647,?

Sequence puzzle made by me. 8388607, 536870911, 2147483647, ?
1 vote
1 answer
171 views

Quick find the unique answer, it may not be unique otherwise!

Replace the question mark with the correct 5-digit number. ...
5 votes
1 answer
218 views

Homemade number sequence puzzle

A homemade number sequence puzzle. The sequence is as follows: 001, 1001, 00001, ?, 001001
8 votes
1 answer
174 views

Two numerical sequences

Two numerical sequences made by me. Make sure to provide reasoning. 90,81,65,29,9,? 46656, 823543, 16777216, ?
14 votes
2 answers
2k views

4,4,2,6,2,10,4,_ sequence from 4th grade packet

The sequence (from my child's "for fun" challenge packet, not for credit or graded) is: 4,4,2,6,2,10,4,_ The possible answers are: A) 15 B) 20 C) 25 D) 28
3 votes
1 answer
319 views

The mystery of 107 numbers

Find the algorithm that was used to create the following sequence of numbers: BAH BAA BBA BAD BBD BAG BBG BAJ BBJ BBC BCC BBF BCF BBI BCI BCB BDB BCE BDE BCH BDH BDA BEA BDD BED BDG BEG BDJ BEJ BEC ...
-3 votes
1 answer
124 views

Apple Sack Reconstruction [closed]

Apple Sack Reconstruction Puzzle Problem Statement: You have an apple tree that can produce apples of four colors: red, yellow, green, and blue. Imagine that you collect all these apples and place ...
4 votes
1 answer
1k 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:
2 votes
2 answers
937 views

2759, 4248, 1152,?

What comes next? 2759, 4248, 1152, ? What is the pattern? The op got it from this site: https://free.ultimaiq.net/nse.htm
9 votes
3 answers
915 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 ...
4 votes
0 answers
328 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
1 answer
690 views

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 = ?
4 votes
1 answer
754 views

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

What number should replace the question mark? Explain why. Hint 1
4 votes
2 answers
203 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 ...
19 votes
1 answer
542 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 ...
12 votes
2 answers
644 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 ...
5 votes
1 answer
958 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 ...
2 votes
0 answers
310 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, ...
2 votes
0 answers
127 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-...
2 votes
1 answer
319 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
0 votes
1 answer
161 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.
1 vote
2 answers
303 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.
8 votes
1 answer
532 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, ...
9 votes
1 answer
487 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 ...
8 votes
2 answers
849 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?
5 votes
1 answer
307 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, ?, ?, ?
20 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,...
22 votes
0 answers
2k views

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 ...
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),...
15 votes
1 answer
918 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 ...
5 votes
0 answers
261 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(...
5 votes
1 answer
592 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 ...
9 votes
1 answer
197 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 ...
5 votes
2 answers
585 views

please Extend this list of Units

Given the following list of four corresponding series of numbers, what would the fifth line look like? 1 : 1.4 / 3 2 : 3 / 2 | 1 : 2 / 6 2 : 3 / 2 1 : 2 / 3 Hint 1: This puzzle was inspired by the ...
6 votes
1 answer
503 views

A healthy number sequence

What should b the missing number? 1, 2, 3, 5, 6, 7, ?, 12
2 votes
3 answers
355 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,...
3 votes
0 answers
154 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: ...
2 votes
1 answer
977 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.

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