Questions tagged [number-sequence]

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

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14
votes
1answer
526 views

250 Floor Tower

There's a tower in a far off land, one that you can only climb by unlocking the secret password to all the floors. Each floor has an inscription on the walls, indicating a number. As you approach a ...
14
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1answer
1k views

Number Pie Chart

What should be the missing number?
14
votes
1answer
356 views

What's up with my calculator?

As I am wont to do, I got a new calculator the other day. Obviously it needed a few test calculations: 5 + 6 = 11 22 - 17 = 5 10 + 3 = 13 4 * 6 = 24 OK, so ...
14
votes
3answers
1k views

Logic behind numeric sequence

There was this sequence on a magazine and the reader has to find the next number: 10, 2, 4, 6, 2, 8 I couldn't find one, then I found the answer in the next magazine. They say the number is 5, so ...
13
votes
3answers
2k views

Three different, and somewhat difficult, sequence puzzles

Here are three different letter/number sequences. Try to solve as many as possible. The spoilers give hints to each sequence in the form of how many elements are in the corresponding sequence. ...
13
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2answers
2k views

What's the next number and why?

What's the next number and why? 1,602,817,493,294,902
13
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3answers
2k views

What is the 30th number in the sequence?

What is the 30th number in the following sequence? 0, 2, 4, 12, 8, 20, 24, 56, 16, 36, ... I'm not sure what would be good hints, or how much further out I should list the sequence. I figure the ...
13
votes
3answers
908 views

Finding Sequence in Third Square

This particular puzzle is throwing me off for some reason, given that solutions I've tried for similar problems are not working. Problem Given that you have this square: ...
13
votes
1answer
2k views

What is the next number in the series?

What is the next number of this series? 1 , 4 , 5 , 6 , 7 , 9 , 11 ?
13
votes
1answer
565 views

Find the next number in this sequence

Find the next number in the sequence : 1; 5; 33; 25; 2; 16; 14; 12; 11; ? What is the next number and why ?
13
votes
1answer
405 views

Infinite Sequence based on Simple Rule

Using one simple rule, an Infinite Sequence has been developed. First 30 terms are given. Can you continue the sequence for at least next Ten Terms? Series continues from top left to bottom right. $...
13
votes
1answer
1k views

Really, really, really hard sequence

... in which you have nothing to do with math ... except maybe with some counting and this and that ... but no calculations, no, definitely no. $1, 0, 8, 62, 90, 68, 83, 89, 88, 057, 619, 028, 693,...
13
votes
1answer
413 views

Twist-onacci Sequence

I started with a well known sequence that follows a simple rule: 1, 1, 2, 3, 5, 8, 13, 21, 34... Then I decided to twist it up a bit, and got this sequence: ...
13
votes
1answer
2k views

What is a CB Number™?

This puzzle is based off the What is a Word™, What is a Phrase™ and What is a Number™ series started by JLee. If a number conforms to a certain rule, I call it a CB Number™. Use the following ...
13
votes
1answer
451 views

Can you explain this cyclic number sequence

Can you work out the mathematical rule for this cyclic number sequence? 2, 6, 186, 8, 456, 54, 53, 23, 7, 301, 3, 21, 2, 6,..... Hint 1 From time to time hints will be updated. Note: this ...
13
votes
1answer
290 views

A grounded number sequence

There is no external source required, this relies only on maths. Each line is independent from the others. Can you find the pattern and fill in the blanks ? ...
13
votes
2answers
840 views

Yet another number sequence puzzle

Number sequence puzzles are very popular of late.</sarcasm> Therefore, I present to you another one. I promise you it has no relation to any sequence in OEIS, nor will it ever be found there, and ...
13
votes
1answer
504 views

Two honeycomb hints (yet another 'find the next number in the sequence')

Find the next number in the sequence $1,7,74,\dots$ First hint: Second hint: To clarify: the 'hints' are really clues. They are hidden, because any of the two alone could be enough to solve the ...
13
votes
3answers
647 views

Find the next number in the sequence: [12, 13], 25, 58, 52, 98, 108, 780, 568, 306

Given this sequence: [12, 13], 25, 58, 52, 98, 108, 780, 568, 306 What is the next number? Note the square brackets. Hint: Hint #2: Hint #3: Hint #4 Hint #5
13
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0answers
477 views

Rethinking this series on the syllabus

I assigned each person in my class the task of creating a number-sequence, however, 4 of the guys I usually consider to be leaders came back with baffling results. Can you make sense of their work and ...
12
votes
1answer
3k views

I was told this is not a math puzzle

But the puzzle is supposedly "Why are those numbers in that order?" 8, 18, 11, 15, 5, 4, 14, 9, 19, 1, 7, 17, 6, 16, 10, 13, 3, 12, 20, 2 Any ideas?
12
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5answers
3k views

Sequence Brain Teaser: Fill the gaps to create arithmetic sequences

Fill in each blank unshaded cell in the diagram below with a positive integer less than 100, such that every consecutive group of unshaded cells within a row or column is an arithmetic sequence. This ...
12
votes
1answer
1k views

Which two numbers complete this number sequence?

Which two numbers complete this sequence? 7, 4, 2, 6, 9, (8), 7, 6, (5), __, __ Hint 1 Hint 2 Hint 3
12
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5answers
1k views

Are you a Detective

A detective friend of yours was trying to find clues for a crime he was investigating, he was almost done but a concluding location will help you close the case. Unfortunately your friend could only ...
12
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5answers
384 views

Whic to erms bgn a f - l qu?

Whic to erms bgn a f - l qu? ...
12
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2answers
733 views

What's the next two numbers in the series?

What's the next two numbers and how did you get to the answer? The series: 2, 4, 4, 8, 12, 16, 48, 64, 288, 448, 1728 Hint 1 Hint 2
12
votes
1answer
898 views

10,400 Reasons to be Afraid

This is a number sequence puzzle. What is the next number in this sequence? 87, 135, 155, 212, 218, 292, 521, (522), (526), 636, 657, 758, (900), (980), 1037¹, 1104, (1110),   ̲ ̲ ̲?̲ ̲ ...
12
votes
2answers
990 views

Simply Riddleculous

An entry in the 19th fortnightly challenge to which I have been assigned riddle + number-sequence by Alconja who came up with the Uncoventional Tag Fusion Idea. If you have any queries you can ask ...
12
votes
3answers
684 views

I know. Another number sequence?

Another number sequence? Ludicrous! Succumb to the madness, give me a chance. Overcome your antipathy for these puzzles, although I’ll understand if you can’t. Man, there are just so many of these ...
12
votes
1answer
691 views

An easily generated integer sequence

Find the next number in the following sequence. It is not purely mathematical but needs only an introduction to mathematics, as generally taught, to answer it and is not very convoluted. 5, 5, 4, 4,...
12
votes
2answers
547 views

An omalonumerophobic's number sequence

Find all seven terms of the number sequence, a1, a2, a3, a4, a5, a6, a7 given that each successive term is exactly twice the value of the previous term no even digits are used in ...
12
votes
1answer
836 views

What is a Frightful Number™?

This puzzle is based off the What is a Word™ and What is a Phrase™ series started by JLee and their spin-off What is a Number™ series. An entry into the 20th fortnightly topic challenge. Main puzzle:...
12
votes
1answer
135 views

Counting with towers

An ancient civilization has been discovered which uses an unusual counting system, based on stacks of blocks. However, most of the information on this civilization has been lost to time, and little ...
12
votes
0answers
1k 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 ...
11
votes
1answer
2k views

I bet you can't find the next number in this sequence

Find the next number in this sequence. 9, 72, 16, 83, 33, 33, 36, 37, 32, 65, ?
11
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7answers
2k views

Missing Piece of Pie - Can you find it?

A piece is missing! What should it be?
11
votes
2answers
1k views

What number follows up next? Part 2

I'm trying to figure out what number follows next in this sequence. Can you help me? 5, 21, 341, 5461, 1398101, 22369621
11
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2answers
1k views

What is the rule for these number sequences?

Can you work out the mathematical rule for these number sequences? It is the same rule for both sequences 2, 4, 16, 7, 49, 25, 9, 81, 9, 81.... 8, 64, 22, 6, 36, 15, 6, 36, 15.... Hint 1 From time ...
11
votes
3answers
1k views

An odd way to subtract digits

Start with an arbitrary positive integer, and construct a sequence from it as follows. For each term in the sequence, subtract its largest digit from it to get the next term. How many consecutive ...
11
votes
2answers
4k views

Which number replaces the question mark in the circle?

While solving the number puzzle, I couldn't find any solution for this problem. Please help me solve it and briefly explain your answer. Which number will replace the question mark in the circle below?...
11
votes
2answers
2k views

What is the next number in this sequence? 0, 1, 11.2, 10.2, 113.2, 103, 103.2, 0.2, 1.2, 2.2, 2, …

0, 1, 11.2, 10.2, 113.2, 103, 103.2, 0.2, 1.2, 2.2, 2, ? The only hint I'll give at this stage is that the sequence is infinite. If nobody gets it within a few days, I'll give a few terms that come ...
11
votes
2answers
905 views

Numbers in the series: The British way

What are the next two numbers in series? Six hundred and forty Five thousand Eight thousand ? ? What are the next two numbers? Is this a trick question? Note: I am using ...
11
votes
1answer
2k views

What is a VP Number™?

This puzzle is based off the What is a Word™ and What is a Phrase™ series started by JLee and the likewise inspired What is a Number™ series. If a number conforms to a certain rule, I call it a VP ...
11
votes
2answers
628 views

A sequence of peculiar palindromes

My son Robin came up with this: 0550, 1001, 1111, 1221, 1331, 1441, 1551, 2002... What are the next 4 numbers? Solve it today!
11
votes
3answers
676 views

Cryptobiology? Biocryptology?

I have a friend who is a self-proclaimed cryptobiologist. Okay, maybe I don't, but if I did, I like to think she would have presented me with this puzzle: Find the hidden message: 441344•...
11
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4answers
2k views

Find the missing number: 321,6; 432,48; 333,81; 432,353; 321,?

Looking for the solution of IQ question below: 321 6 432 48 333 81 432 353 321 ?
11
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2answers
404 views

Find the missing value for “main”

coal 60 mine 63 code 39 lame 41 gain 23 gala 22 main ? Find the missing value for "main"?
11
votes
1answer
602 views

What is a One-In-A-Million 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. If a number conforms to a special rule, I call it a One-In-A-Million ...
11
votes
2answers
383 views

Alternate rankings for the same data

Jill and Suzie are given the same data set and instructed to rank each entry, but they are not allowed to rank the data using the same criteria. Jill goes first and has no trouble at all. She easily ...
11
votes
1answer
227 views

One Step Forward, Two Steps Back

What is the next number in this never-ending sequence? 0 1 1 110 111 101 11000 11101 10101 1100110 1001011 ...

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