### #1 - Pyramid Number Puzzle

The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?
Question 1: What is the next two rows of numbers?

Popular Number Sequence Puzzle
3 1 2 2 1 1
1 3 1 1 2 2 2 1

Line 1 is 'Two ones' (2 1)
Line 2 then becomes 'One two, and one one' (1 2 1 1)
Line 3 therefore is 'One one, one two and two ones' (1 1 1 2 2 1)
Line 4 is 'Three ones, two twos and one one' (3 1 2 2 1 1)
Line 5 is 'One three, one one, two twos and two ones' (1 3 1 1 2 2 1 1)

### #2 - Logical Number Series Riddle

Solve this logical number series puzzle by replace question mark with the correct number
9090 = 4
1234 = 0
6055 = 2
9081 = 4
8888 = ?

8
No Of circles in the number.

### #3 - Find The Next Number

What are the next three numbers in this series?

4, 6, 12, 18, 30, 42, 60, 72, 102, 108, ?, ?, ?

The series lists numbers that are flanked by two prime numbers.

4 (3 and 5 are prime)
6 (5 and 7 are prime)
12 (11 and 13 are prime)
18 (17 and 19 are prime)
30 (29 and 31 are prime)
42 (41 and 43 are prime)
60 (59 and 61 are prime)
72 (71 and 73 are prime)
102 (101 and 103 are prime)
108 (107 and 109 are prime)

thus

138 (137 and 139 are prime), 150 (149 and 151 are prime), 180 (179 and 181 are prime

### #4 - Find Next Number

What is the next number?

77, 49, 36, 18 ?

The next one is 8
77 : 7*7 = 49
49 : 4*9 = 36
36 : 3*6 = 18
18 : 1*8 = 8

### #5 - Sequence Quiz

Find Next Number in the Sequence
2 9 3 1 8 4 3 6 5 7 ?

'2'
This single sequence in fact consists of two sequences: the first sequence is 2-3-4-5-... and the second sequence is 9-18-36-72-... . To make the puzzle harder, all digits have been placed apart. Conclusion: the next term in the sequence is a '2'.

### #6 - Number Series

What is the next number in this series, 1, 11, 21, 1211, 111221 , 312211 ?

Next in sequence is 13112221.

This series describes each number that came before it:
1 [One]
11 [One One]
21 [Two One(s)]
1211 [One Two and One One(s)]
111221 [One One, One Two, and Two One(s)]
312211 [Three One(s), Two Two(s), and One One]

The next number in the series is:
13112221 [One Three, One One, Two Two(s), Two One(s)]

### #7 - Number Series Question

Identify the next two numbers in this series?

101, 112, 131, 415, 161, 718, ???, ???

192 021
If you look at it as two-digit numbers you'll see:10 11 12 13 14 15 16 17 18 19 20 21

### #8 - Number Series Problem

What number comes next in this sequence:
7 8 5 5 3 4 4 ?

6- the number of letters in the month august; (January has 7 letters, February has 8 etc.)

### #9 - Hard Number Series Problem

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

20(Twenty) : when you write them , these are only numbers having vowel 'E'

### #10 - Logical Number Series

Find the next number in this series.

6 14 36 98 ?

276

6 = 11 + 21 + 31
14 = 12 + 22 + 32
36 = 13 + 23 + 33
98 = 14 + 24 + 34
276 = 15 + 25 + 35

### #11 - Hard Number Sequence Riddle

Find the next number in the sequence

5 12 24 36 ?

50

sum of consectuve prime numbers
(2+3 , 5+7 , 11+13 , 17+19 , 23+27)

### #12 - Picture Number Pattern Sequence

Whats the next number in the below number sequence pattern.

1113213211
its like you call it out

one one => 11
two one => 21
and so on

### #13 - Hard Number Series Aptitude Riddle

What is the next number in the series.

15 29 56 108 208 ?

400

Explanation:
15
2*15-1 => 29
2*29-2 => 56
2*56-4 => 108
2*108-8 => 208
2*208-16 => 400

### #14 - Tricky Number Series Riddle

Analyze the series below and find out the next number.
5, 25, 325, 4325, __?

54324

Consider 1 = 5
2 = 25
3 = 325
4 = 4325
Then 5 = 54325

With every digit, the previous numbers are added after that digit

### #15 - Difficult Number Series

Find the next number in the series ?
1 10 24 43 67 ?

96

Difference between two numbers are
9,14,19,24,29.

Difference between every consecutive number is 5.
So next number is 67+29=96

### #16 - Hard Math Sequence Puzzle

Find the next number in the sequence ?

2 3 3 5 5 4 7 5 11 6

13 8 its prime number and then number of letter in prime number

### #17 - Find next number in series

What are the next two numbers in this sequence?

7, 14, 17, 21, 27, 28, 35, 37, ?, ?

42, 47.

They are the numbers that either contain the digit 7 or are divisible by 7.

### #18 - CAT Exam Puzzle

5+3+2 = 151022
9+2+4 = 183652
8+6+3 = 482466
5+4+5 = 202541
THEN ;
7+2+5 =

7*2 , 7*5 , 7*2 + 7*5 -2

### #19 - Missing Number in this Sequence

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

The missing number is 6.
The number in the middle of each triple is the same as the digits of either end's number when added together. 3+7=10=8+2 and so on.

### #20 - Toughest Series Puzzle

What is the next number in this series?

4,12,84,3612....

6526884. To get from 4 to 12, you use the following formula. 12 = (4 squared)/2 + 4.

Continue on with (X^2)/2 + X.