Questions tagged [number-sequence]

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

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3
votes
1answer
1k views

Alphabet Number Matching

If : 888888 = T 777777 = O 555555 = Y 444444 = R then : 666666 = ? Basically you need to tell the logic along with ...
4
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1answer
395 views

A sequence of integers

Here is my sequence (finite): 19,499,12991,337787,8782467,228344156,5936948059,154360649539. You just have to figure out its logic. Hint:
1
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1answer
1k views

Finish The Pattern #2

Given a pattern: 0, 1, 2, 0.5, 2, 3, 5, 1, 2, 0, 2, 1, 4, 2, 3, $n$ Find the next item at $n$. Pattern/sequence explanation required
0
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1answer
2k views

Finish The Pattern #1 [closed]

Given a pattern: 12, 22, 35, 68, 15, 28, 31, $n$ Find the next item at $n$. Pattern/sequence explanation required
5
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1answer
228 views

A Sequence from a Sequence

This is a sequence that I made. I poured by blood and sweat into this! OK, no, it was more like orange juice and yogurt. It wasn't really all that hard, I guess. It might be tricky to figure out, ...
1
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2answers
184 views

A Sequence of Sequences

Originally, this question was way too wide open. I have tried to clarify / narrow it down / restrict the possibilities. Let me know if it is still too wide open. These are some number sequences. I ...
1
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2answers
477 views

Four rows of number sequences

Four rows of numbers: 1234567890 5916708234 192345678 ??? Fill in the last row with the appropriate digits (not necessarily 3, even though there are 3 '?'s). Please explain your answer. Hint/...
-1
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2answers
3k views

Petals around the rose

You roll 5 dice and I'll always be able to give a number uniquely-defined by the numbers on the dice. You have to figure out how it works, without looking it up. Here's a couple example rolls: 1,2,3,...
1
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3answers
653 views

A benevolent but cumbersome batch of four sequence puzzles

Here are four more sequence puzzles. The challenge is to guess the pattern and hence fill in the missing terms. Each "???" denotes exactly one missing term. 6, ???, 5, 8, 4, ???, 7, 3, 4, ???, 4 (now ...
-1
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3answers
2k views

What Comes Next?

Which number comes next in the sequence? 2, 7, 19, 47, 83, ___ Please remember to explain your reasoning and put your answer and reasoning behind spoilers. (Do >! and then your text to put one)
2
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1answer
766 views

What is the next number in sequence?

Consider the following sequence: 6211, 4214, 6321, 4135, 6359 What is the next number in that sequence? What are the rules of that sequence? I hope you'll enjoy my first question :) EDIT 1: ...
0
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1answer
268 views

Explain the sequence in these Excel Fill Series

In Excel Fill Series if you input 23, 132, 2 then 31.33333333, 20.83333333, 10.33333333, -0.166666667, -10.66666667....is generated and if you input 13, 16, 17 then 19.33333, 21.33333, 23.33333, ...
7
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2answers
470 views

Bitwise multiplication

Mr. EG has come up with a great coding scheme for (non-negative) integers in binary. To show off his creation, he demonstrates the following multiplications: ...
-4
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2answers
526 views

Solve the numeric sequence

I've thrown together some fun sequences to stretch your brains out! You can feel free to provide as many additional members of the sequence as you'd like, but mostly I'm looking to see if you can ...
7
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2answers
2k views

Figure out this algorithm by analyzing the sequence of numbers generated

You are given a function f that, using an algorithm (that uses an old method), performs a calculation on four distinct values _ and generates a sequence of ten numbers. Now, your task is to figure ...
6
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8answers
50k views

Fill the holes? [closed]

You have to fill the boxes to make the equation true:   +   +   = 30 Using only 1, 3, 5, 7, 9, 11, 13, 15. You can also repeat the numbers. (eg: 1 + 1 + 1) Edit1: the boxes of the equation are ...
32
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2answers
3k views

Ancient machine in the desert… how does it generate its output?

I was walking through the desert and came across an ancient contraption of cogs and gears. It had a series of dials on one side that appeared to allow the input and output of numbers. On the other ...
16
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1answer
667 views

Sorcery squares!

The following 5-by-5 squares of digits are not magic squares, but nevertheless they each have a crucial property which enabled me to generate them. What is that property? How could you generate more ...
9
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2answers
2k views

What is the next term in the sequence?

The first term is f(0), the last term is f(2000): 0,0,0,0,1,0,1,0,2,1,1,0,2,0,1,1,3,0,2,0,2,1,1,0,3,1,1,2,2,0,2,0,4,1,1,1,3,0,1,1,5,0,2,0,2,2,1,0,4,1,2,1,2,0,3,1,5,1,1,0,3,0,1,2,6,1,2,0,2,1,2,0,4,0,1,...
7
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1answer
205 views

Find the replacement for `?`

624 --> 20 532 --> 117 634 --> 152 723 --> 40 443 --> 175 825 --> ? What should be filled in the last place so as to maintain the ...
0
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1answer
384 views

A final batch of four sequence puzzles

This is my seventh (and probably last) batch of sequence puzzles that are nasty and hard to solve; I stress that each of them has a clear and justifiable solution. Sequence 1: RC, NU, RT, RS, PI, ...
1
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2answers
780 views

From a math Professor, Bernard Budiansky

What is next in the sequence? 50, 42, 34, 28, 23, 18,14, ?
4
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2answers
261 views

Yet another batch of four sequence puzzles

This is my sixth batch of sequence puzzles that are nasty and hard to solve; yet, each of them has a clear and justifiable solution. Sequence 1: Ca, Cl, ??, Er, ??, Po, Te, Th, ?? Sequence ...
16
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5answers
2k views

Should the angels play their game?

Two angels in heaven want to play a game. One of them comes up with an arbitrary, computable function from the integers to the integers. The other angel has to guess what it is. The second angel can ...
2
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3answers
297 views

One more batch of four sequence puzzles

This is my fifth batch of sequence puzzles that are nasty and hard to solve; yet, each of them has a clear and justifiable solution. Sequence 1: T?M, AOT?, ROT?, AN?, T?SB, ROT?, TFA Sequence ...
6
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1answer
1k views

Find the missing number

What number should replace the ?
0
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3answers
350 views

A batch of four sequence puzzles

This is my fourth batch of sequence puzzles that are nasty and hard to solve; yet, each of them has a clear and justifiable solution. Sequence 1: 2, ?, ?, ?, 0, 3, 7, 6, 4, 6, 9, 0, ?, 0, 4, 3, ...
8
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1answer
1k views

What is the next number in the sequence?

What is the next number in the following sequence? 9999999, 4782969, 217728, 1568, ??? I saw this question in an app and I am stuck. Can you help me? Source: https://play.google.com/store/apps/...
5
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4answers
297 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,...
2
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5answers
846 views

Five further sequence puzzles

This is my second batch of sequence puzzles that are nasty and hard to solve; yet, each of them has a clear and justifiable solution. Sequence 1: 18, 17, 18, 22, 26, 35, 32, 32, ??, 38, ??, 52, ?...
10
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4answers
1k views

Five sequence puzzles

The following five sequence puzzles are quite nasty and hard to solve. Yet, each of them has a clear and justifiable solution. Sequence 1: ?, ?, ?, B, B, C, ?, ?, F, ?, S, M, A, S, P, S, C, A, .....
3
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2answers
2k views

whats the Missing Number?

In this grid of numbers, what is the missing number (in place of the question mark)? $$\begin{array}{|c|c|}\hline2&7\\\hline8&9\\\hline\end{array} \begin{array}{|c|c|}\hline0&3\\\hline5&...
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 ...
6
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2answers
535 views

Determine what the last number in this series is

4, 23, 20, 12, 14, 9, 20, 19, ? Also explain your reasoning.
8
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1answer
549 views

Pattern 1 — Numbers

Fill in the missing number: 10, 30, 60, 01,__, 12 Use a bit of lateral thinking. And math. Also, I do know the answer. Just giving the question as a teaser.
-3
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1answer
467 views

Finish The Pattern

Please note I realize there could be many "correct answers" but I'm looking for a specific one. 1, 3, 5, 4, 2, 7, 6, 8, 9, 3, 4, 5, 8, 2, 9, 3, 5, 2, 42, 35, 42, 52, 55, 52, 109, 85, 120, ?, ?, ? ...
7
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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 ...
5
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2answers
462 views

Continue this number-triplet series

(4-6-4) (6-12-8) (8-12-6) (12-30-20) What is the next number triplet - and why? I'll add hints if nobody gets the answer first. In the past I've used this riddle in a game with my RPG gaming group. ...
1
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2answers
4k views

What is the next number? 24,54,90,120,168,210,240,288,360,440 [closed]

Question : What is the next number in the following sequence? (not finite) $$\large24,54,90,120,168,210,240,288,360,440,\dots$$ My Solution I'm trying a closed form solution I tried computing ...
11
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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 ...
6
votes
3answers
977 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. $1,$ $1,$ $2,$ ...
2
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1answer
2k views

Find the next number in the series?

Find the value of 'a' and 'b' in the following series. 100,101,120,103,410,321,205,404,60a,5b2

1 9 10 11 12 13