Questions tagged [number-sequence]

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

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6
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1answer
540 views

Last sequence puzzle on NSE stuck on

There's another puzzle on nse that I don't know how to do, and the only one besides my other question here. 91420512, 1297514, 35172115, ? Any answer would be ...
6
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1answer
1k views

Oh no! Yet another number series… - Find the pattern in the two examples and provide an extension

Because these have been so successful in the past, I had to bring up my own. In fact, this puzzle was inspired by Find the next number even though I (and I guess everybody but the author) still don't ...
6
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2answers
450 views

Ten Sequences With a Theme

Each of the ten sequences below have a similarly worded rule that determines the next number in the sequence. Try to figure the rules and subsequent numbers for each of the sequences. They are not ...
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2answers
343 views

A real-world puzzler - find the pattern!

This is a bit of an unusual puzzle - one that is purely "real world" :) My console can produce a load of colours. But I can't find any obvious way to relate the colour to its number. I'd hoped that ...
6
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2answers
492 views

Number sequence solving strategies

Number sequences are one of the oldest puzzle categories in the book. You would find it hard to look through a days worth of puzzles posted here and to not find any puzzles that involve some sort of ...
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5answers
3k views

20 cards facing down

You have a row of $20$ cards facing down. A 'move' consists of the following actions performed in sequence: Pick a face-down card and flip it face-up If there is one, also flip the next card on ...
6
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2answers
2k views

Fill in the blanks of this number sequence

Can you fill in the missing numbers of these number sequences? _, 3, _, 9, _, 14, _, _, 21, 27, _, 35, _ _, 7, _, 15, _, 22, _, 30 _, _, 5, 7, _, _, 12 The three sequences may or may not be linked ...
6
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3answers
981 views

What is the next 3 numbers?

These numbers are created with a formula. Guess the formula for increment and calculate at least 3 next numbers of this sequence. increment is started with two given first $1$s. $1,$ $1,$ $2,$ ...
6
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1answer
234 views

Find next number in the sequence

I want to share a question that is created by myself. I will give a hint every 24 hours and my answer in 3 days given that nobody could answer my question. 5, 6, 2, 4, 0, 2, 5, 1, 3, 6...
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2answers
517 views

IBM PAT Number Sequence

I am looking at an old IBM PAT (circa 1965) and am stumped by a number sequence question. This is it: Identify the pattern in the following sequences and select the option which indicates the next ...
6
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3answers
328 views

Just some simple calculation to return this pattern

Here is a table, inside there are simple operations to perform, but there are also particular numbers that don't have the same logic. So how difficult will it be to find the last number and the ...
6
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1answer
323 views

What is the next number in the sequence

What could be the next number in the sequence: 57, 74, 65, 61, 37, 58, ?
6
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1answer
213 views

An ad-hoc number sequence to solve

Inspired by another question here, I thought I might create my own: Fill in the correct number in this sequence: 5, 3, 4, 9, 8, 3, 5, ... And of course, explain why :)
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1answer
414 views

What is a Reversible Number™

This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles, and the likewise inspired What is a Number™ series. If a number conforms ...
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2answers
540 views

Determine what the last number in this series is

4, 23, 20, 12, 14, 9, 20, 19, ? Also explain your reasoning.
6
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2answers
297 views

number sequence puzzle deep six

Just a quick puzzle I just thought up. (so apologies if this has already been done) Here's numbers 1 to 5 in a sequence: 5-4-1-3-2 I now want to add the number 6 into the sequence, but where ...
6
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3answers
222 views

What's the secret text?

Poem: The sequence leads you there The "shift" is not that rare It is ancient, you will see Jupiter is the key 14 15 92 65 35 89 79 ?? OGSULLOIOGRREYSGXZ Hint Big Hint
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1answer
451 views

Find the missing term!

Complete the sequence and state the pattern/logic behind the answer. 8,9,10,11,12,14,16,18,20,22,24,26,28,?,48,72 The sequence ends at 72.
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1answer
181 views

alphabetic or numeric or alphanumeric

Find the possible next three positive numbers in the below sequence: 5, 8, 10, 9, 8, 3, 18, __, __, __ And based on the above, as a bonus, find those 4 smallest positive numbers that cannot be fit ...
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2answers
413 views

A powerfully, powerfully, powerfully written number sequence

Find the missing terms a17 , a19 and a22 of the sequence, 15 , 20 , 13 , 2 , 20 , 17 , 17 , 19 , 19 , 15 , 14 , 4 , 21 , 4 , 20 , 17 , a17 , 19 , a19 , 15 , 14 , a22 The sequence uses only basic ...
6
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1answer
180 views

Two related number sequences; 20,12,14,8,7 and 4,1,5,9,11

Can you predict the next numbers in these two sequences, which are strongly related to each other. 20,12,14,8,7 and 4,1,5,9,11 these number sequences do not appear in oeis.org
6
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1answer
265 views

A mathematical number sequence

Can you deduce the next three terms and long term behaviour? $$0, 1, 1, 2, 3, 7, 22, 29, 45, 100, \dots$$ This sequence is not in the Online Encyclopedia of Integer Sequences (OEIS).
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1answer
120 views

A Sequence Riddle [duplicate]

Here is a list of numerical sequences: 1, 3, 5, 4 2, 3, 5, 4 3, 5, 4 4 5, 4 6, 3, 5, 4 ...and so on. (1 is 3 and 2 is 3, but 1 is not 2 and 2 is not 1. The same rule applies to every number in the ...
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2answers
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The number sequence algorithm that solves them all!

Inspired by a student who was asked the typical question of What is the missing number in the sequence 8, 15, 25, 38, ??, 73 I thought: Well, this type of question is silly; if the student ...
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2answers
554 views

**Implication is the key**

Submitted at part of the Fortnightly Topic Challenge #19: Unconventional Tag Fusion I am within a secret close to my writer, Implication is the key, Go forth to thee and once fifth, I am the root of ...
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2answers
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Numbers on a dartboard - we know why they are in that order but how was it calculated without computers?

The arrangement of the numbers around the circumference of a standard dart board is as shown below 20 1 18 4 13 6 10 15 2 17 3 19 7 16 8 11 14 9 12 5 ...
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1answer
185 views

Find the next number in the following sequence [Mind bender]

I came across this sequence in the paper: 109080, 12123, 1350, 153, ? What could be the next number? And what is the pattern that connects these numbers? Dividing a term by the next term leads to a ...
6
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1answer
150 views

A very basic number sequence puzzle

Predict the next members of the sequence below and explain what the relationship is. 2, 10, 101, 1211, 14321, ...
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2answers
534 views

Jumping on the Bandwagon

It seems like there's been a constant flow of new, and mostly questionable, number sequence puzzles popping up on the site recently. My turn to add to the proverbial three-ring circus! $0, 9, 5, 1,...
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1answer
773 views

Old Gregory had a farm: The Missing Eggs

Gregory is a farmer and every morning he makes sure to harvest the eggs of his chickens. He has 72 chickens and 12 chickens in each cage, so a total of 6 cages. Each of his chickens lays only one egg ...
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2answers
388 views

What is the (apparently) next number in the sequence?

$42, 62, 67, 14, 27, 45, 4, 14\dots$ This is the number sequence which does not appear in OEIS and actually has little to do with maths. To find the next number, please look at the title and the tags!...
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1answer
145 views

Number sequence labyrinth

Can you find the way out of the labyrinth ? Rules: Each color you pass is a number (or character) sequence, you have to note the solution of this sequence. When you're out of the maze, your ...
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1answer
404 views

What are the missing digits?

What are the missing digits? |3|2|2| |1|8|8| |?|2|8| |2|4|4| |9|2|2| |2|5|?| I was given this puzzle by a friend and I just can't see anyway to solve it...
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1answer
481 views

What is the next sequence of numbers?

Seven and seven is forty-two, Eight and nine are fifty; Ten and eleven are sixty-two, And twelve and twelve are five. What is the next sequence of numbers?
6
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1answer
257 views

Another Next Number Question

This is a bit different number sequence. Format and punctuation are on purpose. What are the blanks? 4 1 2 2 '1 2, 1 1 2 1 1 1 1 2 1 1 1: 1 2 1 1 3, _ _ _ _ _. ...
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4answers
300 views

Yet another group of five sequence puzzles

This is my third batch of sequence puzzles that are nasty and hard to solve; yet, each of them has a clear and justifiable solution. Sequence 1: 2, 4, 4, 3, ?, ?, 3, 4, 2, 4, 3, 4, 2, 2, 3, 4, 4,...
5
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1answer
474 views

Next number sequence

Be forewarned: this is a riddle in the spirit of riddles. Given the following: ...4522222222255555555599999999 What are the next digits? Note: I did not specify the number of digits you should ...
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3answers
834 views

Can you find the value of the question mark$\color{red}?$

Puzzle: Find the value of the question mark $\color{red}?$. $$(2, 13, 47)$$ $$(5, 7, 19)$$ $$(8, 1, \color{red}?)$$ Hint 1: $\color{red}?$ is a prime. Hint 2: $\color{red}?$ is a cyclops. ...
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4answers
1k views

Find the missing object

1. 2. 3. 4. 5. 6. ? 7. Find the missing object (No. 6) Note:The first one to post an object with the matching criteria will be the winner.
5
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2answers
728 views

Number sequence: 202500, 5184, 32400, 12960,?

Can you solve my first selfmade number sequence ? 202500, 5184, 32400, 12960, ? Hint: Hint: Hint
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5answers
661 views

Number sequence 15, 18, 30, 39

Given the number sequence 15, 18, 30, 39, 54, 69, 78, 90, 93 can you predict the next two values (or more...?) Note that This number sequence does not appear in the online encyclopaedia of ...
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1answer
2k views

Strange code made of hand sign and number

I came around a website recently and I noticed these strange hand illustrations, followed by a number. You can see hundreds of different snapshots of the website using the archive.org wayback machine ...
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1answer
647 views

NSE Numerical IQ Test no.12: 759802, 358829, 847123,?

This is a question from the NSE Numerical IQ Test by Theodosis Prousalis and Ivan Ivec: 12) 759802, 358829, 847123, ? After 2 hours, I can't figure out the answer. I've only made these ...
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2answers
231 views

What is the next number in the sequence 1, 15, 9, 14, 18, 20, 25, 6?

1, 15, 9, 14, 18, 20, 25, 6? What is the next number in the sequence? Note: This sequence is not in the OEIS
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1answer
639 views

The “Evan” Numbers

The Even numbers are simple: $2, 4, 6, 8, 10, 12, \dots$ The "Evan" numbers follow a tricky rule: $2, 4, 6, 30, 32, 34, 36, 40, 42, 44, 46, 50, 52, 54, 56, 60, 62, 64, 66, 2000, 2002, 2004, \dots$ ...
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2answers
397 views

What's the next number in the sequence?

What is the next number in the sequence? 22 , 15 , 1 , 14 , 16 , 3 , -2 , 10 , 9 , 7 , ? I will be adding more hints later if required :) HINT 1: HINT 2: HINT 3: I am new here, any ...
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3answers
473 views

Help me open my safe

Edit: The first version of this puzzle was apparently too hard. After a days worth of back and forth, I am consolidating all hints, answer attempts, and comments into a restated puzzle here from the ...
5
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1answer
404 views

First Contact With Aliens

There is a strange meteor that is caught by the Earth's gravitational pull. No one even notices it because it is so small it will simply burn up in the atmosphere -- but it doesn't. Instead, it ...
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2answers
217 views

Please Resolve Interesting Mathematical Equation

As noted in the title can you find the mathematical expression for the following sequence of numbers? 1, 2, 2, 4, 1, 1, 3, 3, 4, 9, 1, 1, 3, 5, 9 From time to time hints will be updated. Note: ...
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2answers
349 views

PanGalactic Timber

Here at PanGalactic Timber Company, we've rescued an Alien Artifact from the ruins of New York City, caused by those so-called "Avengers." This allows us to traverse the universe in search of high-...

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