Questions tagged [number-sequence]

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

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3
votes
1answer
280 views

Complete the series:

$4427, 827, 67, 31, 9, ?$ Choose between: (a): $7$ (b): $6$ (c): $5$ (d): $4$ Looking at the numbers I think that there must be some exponential relationship but couldn't find it. I took the ...
3
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1answer
478 views

Number sequence with two missing numbers 15, 39, $\frac{1}{8}$, $\frac{1}{49}$, 100, 11, __, __

Given the following incomplete number sequence: 15, 39, $\frac{1}{8}$, $\frac{1}{49}$, 100, 11, __, __ What are the two missing values?
3
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0answers
170 views

Encrypted growing sequence

The following sequence has been encrypted: 1-0 3-0 6-1 ...
11
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2answers
781 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 ...
0
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1answer
105 views

Can't solve this sequence number puzzle [duplicate]

Im almost about to give up with this, So my answers were 1311 and 1221, but both are wrong, can't manage to see other logical solution hehe. first one is because I though it was sequence where you ...
3
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1answer
168 views

What is the missing number in this grid composed by 25 values?

Well, I have created a simple table with 25 values, inside it, all the data is readable, except for one that is hidden. Can you guess it? The table:
6
votes
1answer
159 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
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0answers
145 views

Novel integer sequence problem?

In the following sequence, what should be the next number? 1 1 1 2 5 1 1 2 2 4 5 8 17 50 11 ?
-5
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2answers
127 views

You can solve this!

Can you solve this? 1=2 3=18 5=50 4=32 Then 6=?
1
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0answers
119 views

Find the missing number in the series

Numbers in the series: 4,12,14,16, ?, 25 Please help me find the missing number in the series above. I have already tried with different sequences but unable to solve this. Thanks.
8
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1answer
192 views

Sequence - stop at 90

You start with 0 and then proceed as follows: 1, 8, 2, 1, 11, 9, 18, ??, 90 There's no other number after 90 in this sequence. In fact, it's impossible to find! One of the numbers can be replaced ...
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2answers
85 views

How can I find the total number of rabbits if they reproduce at a constant rate? [closed]

The problem is as follows: Roger adopts two female rabbits and two male rabbits. Three months later each female rabbit gives birth three female rabbits and three male rabbits. Assuming that if ...
9
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1answer
393 views

Given these numbers, find the hidden word

Given this sorted list of 33 numbers, is it in your power to find the riddle they are hiding and figure out the secret word? ...
38
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3answers
2k views

What comes next in the sequence?

My roommate has insomnia so he was counting sheep to help him sleep. He started with $2986$, then continued with $47786,\ 764586,$ and $12233386$. What sequence is he following, and what was the ...
2
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1answer
65 views

Sequence Puzzle - Sequence Of The Day

Look at these two sequences. The rules of these two sequences are the same. 0 32 15 3 9 5 4 2 6 7 13 110 174 155 314 2120 5360 24671 119546 193002 240820 274454 153700 1397287 17916598 26245242 ...
5
votes
1answer
122 views

What's the missing number in the sequence?

This is my first post so I'll keep it simple and easy. The following numbers form a series but a number is skipped in it.Find that missing number and its position (The number can also be at the ...
8
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1answer
563 views

What is the next number? (an accounting interview question)

I got this question from an accounting interview: What is the next number? 0 1 3 8 56 65 ? What are the rules of the sequence?
4
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1answer
217 views

Where are 75 and 34?

$$32 \supset 108 + 110$$ $$98 \supset 97 + 116$$ $$71 \supset 31$$ $$98 < 117 < 38 < (31 = 87) < 32 < 84 < (105 \approx 115) < 49 < 113$$ $$(39 = 65 = 68 = 70 \approx 67) \...
7
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1answer
381 views

What are the missing 7 numbers?

Below a sequence of numbers is stated, I'm looking for the 7 missing natural numbers which should replace the 7 x's. Counting will give you information which can be neither positive nor negative. ...
4
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5answers
2k views

Find the algorithm behind this repeating number sequence

During a garage sale I saw a strange old electronic device (not really, it's just flavor story). It had a battery slot, a button and a row of seven-segment displays - though from all except the two ...
6
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2answers
379 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!...
16
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2answers
655 views

16 number puzzles on a blackboard

I have left you some number puzzles on the blackboard. Solve them and let me know what they spell. Hint:
5
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2answers
222 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
6
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2answers
218 views

Number sequence: 1, 2, 9, 48, 120, 162

First time entering a puzzle so I have no idea if what I've made is too easy. But it's not on OEIS at least. Find the next term! 1, 2, 9, 48, 120, 162, __
10
votes
1answer
301 views

What is the next number in the sequence 0,0,16,28,77,144,264?

0,0,16,28,77,132,264 What is the next number in the sequence? Note: This sequence is not found on OEIS
5
votes
5answers
651 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 ...
1
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1answer
147 views

Missing number!

The 4 quadruples are complete, however the 5:th one is not. Replace the question mark. (All 5 quadruples follow the same rule)
14
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1answer
1k views

Explain the number sequence and predict the next 6 numbers

Given the number sequence 0,1,4,9,0,1,9,1,4,2,1,3,0,4,1,5,4,6,9,7,0,9,9,a,4,?,?,?,?,?,? the challenge is to Determine the value represented by a Predict the next 6 entries represented by ? Note ...
4
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1answer
351 views

Numbers Brain Teaser

I've come across a strange brain teaser on one of those sheets with things like: (man overboard) So here's the puzzle: 0 - 20 10 - 3 14 - 29 96 - 72 1977 I've been trying to ...
6
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1answer
292 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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2answers
439 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 ...
4
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1answer
216 views

Four sequences made in a specific way

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10
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5answers
2k views

Aces, twos, threes, and fours in a row

Take the 4 aces, 4 twos, 4 threes, and 4 fours from an ordinary deck of playing cards. Is it possible to place all 16 cards in a row on a table so that there is precisely 1 card between any 2 ...
13
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3answers
640 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
5
votes
1answer
197 views

Find the formula and the missing number in the series

Given the series below, can you find its formula and hence the missing number? 3, -1, 7, 8, 20, 35, 43, 76, ??, 131, 159
11
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1answer
219 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 ...
12
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1answer
131 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 ...
8
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1answer
432 views

Find the next number and what I am!

This is the first puzzle I made and apparently it's too difficult. So I tried to create hints, but it's hard. If you have any ideas on how to write this riddle in a better way, or have more "...
2
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4answers
649 views

Obscure IQ test question

I stumbled upon this (probably simple) mathematical matrix I just couldn't solve. The problem is I came up with the answer 12 (which isn't one) and now I am so fixated on that that I am having trouble ...
-2
votes
1answer
86 views

Formulating sequences in particular ways

Let's have the following sequences: 772,6772,59404,521092,? 298,2614,22930,201142,? What comes next, where the question marks are?
-1
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1answer
113 views

My favourite two number sequences are below do you know/ can you guess them and what are yours? [duplicate]

3.3.5.4.4.3.5.5.4.3.6.6... and 8, 5, 4, 9, 1, 7, 6, 3, 2, 0
37
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3answers
7k views

What is the next number in the series: 21, 21, 23, 20, 5, 25, 31, 24,?

I came across a puzzle from a workbook for primary school students who wish to sit in exams for enrolling to selective high schools, which asks about what is the next number in the series. What ...
5
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2answers
890 views

A riddle by any other name

On his retirement, Bill Gates left behind a four number combination safe with a dial similar to this. In that safe is a secret that had eluded him many years ago...along with a small fortune of course....
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2answers
1k views

A geometric sequence using one digit

Give the first few terms of a geometric[1] sequence such that: the sequence is increasing and infinite only one digit is used throughout the sequence the terms are written as base ten ...
-3
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1answer
138 views

Number puzzle! Find “?”

Replace the question marks. 1, 1, 2, 3, 6, 7, ?, 11, 14, 19, 20, ?
-4
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1answer
225 views

What’s the next number in the sequence?

I have a numeric sequence: 1,4,5,5,7,9,9,6,6,11,13,11,? What is the next number in the sequence and what pattern does the sequence follow? This sequence has to do with prime numbers and the sequence ...
8
votes
3answers
1k views

What comes next in this sequence, and why?

I'm having the hardest time with this sequence puzzle. The mobile game I play (which asked me the question) doesn't provide answers or explanations for incorrect answers, and I'm searching online so I ...
3
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1answer
134 views

Replace “?” in a squence of numbers

Replace the "?" in the following sequence:$ $ 2 7 10 13 14 22 26 27 28 31 49 53 54 57 78 79 ? 90 101 106 109 110 111
2
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1answer
139 views

Placing three sets of cards Ace to 9 in a row

From an ordinary deck of playing cards remove cards ace to nine of any three suits (27 cards in all), and place them in a row so that between any 2 consecutive aces there is precisely 1 card, between ...
4
votes
2answers
284 views

Number sequence. What's next?

Replace the question mark. Ill give hint if noone can solve it within a couple of hours. 5, 12, 24, 36, 52, 68, 84, 100, ?

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