Questions tagged [number-sequence]

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

Filter by
Sorted by
Tagged with
13
votes
2answers
2k views

What's the next number and why?

What's the next number and why? 1,602,817,493,294,902
1
vote
2answers
397 views

Interesting number sequence puzzle

What's the next (last) number in the following sequence? $1,2,3,4,5,6,8,9,10,\underline{~~?~~}$ (both mathematical and non-mathematical answers are welcome)
6
votes
2answers
9k views

What will come in place of question mark 10 , 6 , 8, 15, 34 ,?

I can't figure out what will come next in the sequence $10,6,8,15,34,...$ . I am thinking everything, but cannot seem to find a pattern. Any hints please...
4
votes
4answers
1k views

What is the next number is this sequence?

26, 20, 4, 16, 10, 2, 14, ? I have tried everything.. I don't know how to solve this.. If you solve it post the solution please. Thanks!
-1
votes
1answer
173 views

Find the numbers in sequence [closed]

Find the next 3 numbers in 1.1, 2.4, 3.9, 5.6, 7.5, __, __, __ And specify the relation .
7
votes
3answers
2k views

Next number in the sequence 19, 10, 11, 18 ,38,?

What is the next number in the sequence 19, 10, 11, 18, 38,? The options are 97.5 110 115 124.5 99.5 I got an image from a book that had this question. I can't solve it. Any hints? Question ...
3
votes
1answer
2k views

Program for number sequence cracking

This is a general question which I'm not really quite sure is appropriate here so before you decide to down vote, just drop me a message that it's not appropriate and it will be promptly removed or ...
3
votes
2answers
349 views

What number is missing?

This is a sequence, that if transformed correctly, gives a sequence that is easily recognized by experts in a particular field of science. There is a number missing, though. Can you help? 57, 86, ...
1
vote
2answers
156 views

Simple yet tasty sequence

Here's a sequence I know of that offhand isn't obvious. $0.14,0.14,3.28,3.28,9.57,3.28,9.57,3.28,9.57,15.85,3.28,15.85,...$ Keep in mind that this sequence originally looked like something else, ...
8
votes
2answers
428 views

A sequence defined by a single fraction

I have a sequence of numbers here, which follow a very simple rule that can be expressed using a single fraction: 1, 2, 10, 11, 13, 15, 20, 22, 25, 28, ... What is this rule (in particular, what ...
5
votes
2answers
393 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 ...
9
votes
2answers
267 views

Number Patterns

Your mission, if you choose to accept it, is three parts: A) Figure out the pattern; B) Give an eleven-number sequence beginning with 2 that follows the same pattern; and C) Give an eleven-letter ...
2
votes
2answers
474 views

A puzzling data-driven sequence

First puzzle! I was inspired by this question to make my own. Props to the author for itching my brain! Update: I double-checked the sequence, turns out it changed! I overlooked something which I ...
9
votes
1answer
753 views

A sequence about you (Puzzling Stack Exchange users)

I have a mysterious sequence for you... $204, 186, 172, 133, 126, 123, 120, 119, 111, 107, 102, 96, 90, 87, 86, 86, 85, 79, 75, 73, 70, 68, 66, 66, 65, 65, 65, 64, 64, 64, ...$ This sequence may ...
5
votes
3answers
448 views

What's the next number? You may need some help

What's the next number in the following sequence: 1, 3, 6, 7, 9, 11, 13, 14, 18, 21, 23, 28, 31, ___, ... Not sure if this one is easy. Hints will be released gradually. First one is in the title :...
4
votes
1answer
564 views

Complete the sequence (easy)

What three-digit numbers best complete the following sequence: 33, 45, 54, 32, 11, 23, ___? There are two possible answers. One is composite and one is prime. Find both.
31
votes
1answer
2k views

Professor Halfbrain and the sum of the digits of all divisors

Yesterday I met professor Halfbrain in the city. The professor looked tired and somewhat exhausted. He told me that he had spent his nights and days with adding up digits of divisors of positive ...
-2
votes
3answers
373 views

Next number in Sequence? [closed]

What is the next number in the sequence: 1 4 23 25 26 ? Also, could you answer the logic that goes with it.
13
votes
1answer
287 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 ? ...
-8
votes
1answer
954 views

Next number in the sequence

Find the next three numbers of the number series : 0,0,3,20,115,?,? And please also tell the series this series is following
6
votes
4answers
2k views

What is the number in the square with “?”?

This is an IQ test I found recently. What is the number in the square with "?"? I have thought it for a long time but cannot know the answer. Does anybody know the answer and the reason? Thanks in ...
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,...
12
votes
2answers
606 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
15
votes
9answers
5k views

Is this sequence that hard?

I published a sequence that seems difficult to the general public, so I've thought of posting it here. It has a very simple logic (language independent). Can you figure out the next number?
-1
votes
2answers
226 views

The king and his daughter! [duplicate]

Years ago, there was a small kingdom, in which there was a king. His daughter was so beautiful, that people around the world went there to marry her. But the king would allow the most clever man to be ...
17
votes
2answers
1k views

Logically linked numbers

The left and right numbers are linked. What should the last number on the right be, and why? \begin{align} 135759&: 1 \\ 151364&: 4 \\ 255075&: 9 \\ 279422&: 36 \\ 292620&: 91 \\ ...
4
votes
2answers
313 views

What number comes next in this sequence?

What comes next in this sequence? 4, 3, 9, 5, 19, 9, 39, 17, 79, 33, ? It didn't immediately jump out at me, but ended up not too challenging and thought some may enjoy it.
35
votes
2answers
2k views

A powerful drink

I'm addicted to this stuff. I had my first double when I was 16. There were five of us that night on the town. I didn't think much of it then, but two years later I had another double, and then ...
5
votes
1answer
459 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 ...
10
votes
3answers
667 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•...
9
votes
6answers
2k views

A mosquito is born at T=0 and after 2 seconds makes a new mosquito every second, how many mosquitos at T=8.5? [closed]

One mosquito is born at T=0 and after 2 seconds it makes a new mosquito, and another every second thereafter. All such mosquitoes have this same property and do not die. How many mosquitoes there are ...
12
votes
1answer
685 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,...
5
votes
1answer
170 views

Phil has Phound a Saphe

Phil has phound a secret room Hiding in his basement. On the saphe within that room: Numbers slight phaded. Every combination tried Phailed to crack it open. Can you phind the phive digits?...
13
votes
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 ...
2
votes
1answer
1k views

What is the next number for this sequence and the rule(s) that describes it?

What are the next four numbers and the rule that generates the sequence? 0, 2, 8, 24, 64, 160, 384, 896, 2048, ... Explain the hints and how you reached the answer once you have got it. Hint 1: ...
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 ...
5
votes
3answers
467 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 ...
16
votes
5answers
2k views

Important days in history… and to come!

The other day I decided I wanted to come up with another simple puzzle before releasing another toughy on puzzling.SE. I came across an interesting series of dates that I wanted to share and see if ...
10
votes
1answer
1k views

The end of the life!

$1\ 16 \ 41 \ 55 \ 79 \ 90 \ 103 \ 120 \ 123 \ ?$ What is the last number in this different sequence! If you find it, it will be the end of the life!
7
votes
2answers
369 views

Four indeed is cosmic!

This puzzle deals with positive integers in decimal representation. From every integer you can move to one or two or three other integers. The allowed moves for integer $n\ge1$ are as follows: You ...
0
votes
1answer
94 views

Wieder Panic in the number sequence

Find the next term of the following 2 Series:- $A. (3,5,11,17,31,41,59,__)$ $B. (1,1,1,2,5,21,233,__)$ Hint:-
2
votes
3answers
3k views

Every number eventually equals 4 [duplicate]

This is my first Puzzle posting on here. If I can figure out how to do a spoiler, I will add in a hint. Best of luck! I heard this one a while back, and I don't know how well known it is. Example 1: ...
3
votes
3answers
337 views

Encoding Extreme #5

Last night, you went to a party and someone knocked you out, then grabbed you and locked you in a small room. You're trapped! After awaking and examining the room, you see that it's a storage locker. ...
4
votes
1answer
956 views

Fill the missing number puzzle

I have this puzzle that none of my colleagues (including me) can figure out and I can't sleep because of it :). Can someone please help: Thank you.
4
votes
1answer
195 views

A Lunatic's Sequences

My uncle Todd is a little off his rocker. He's getting on in years, and sometimes I find him outside at night scratching numbers in the dirt with a stick. Last night I found him sitting quietly in ...
6
votes
2answers
1k 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 ...
7
votes
1answer
436 views

Matrix sequence

While a one-dimensional sequence is represented by a list, a two-dimensional sequence (a sequence of sequences) can be represented by a matrix. Find the pattern behind the following sequence, where a ...
2
votes
0answers
44 views

Pyramid of hopelessness [duplicate]

Here are the numbers.... What'cha gonna do? (try and solve it...duh) ...
3
votes
5answers
302 views

What is the next in this ordinary sequence?

3 4 9 8 9 8 13 14 13 ? So what is the next number? Hint Hint
10
votes
1answer
508 views

Find the missing properties of cyclic number

Guess a 6 digits number in the form of $\ abcdef$ which holds Properties #1, #2 and #3. The real challenge is to find 4 other interesting properties of this number: Property #1 $\ a+d=b+e=c+f=9 $ $\...

1 9 10 11 12 13