Number Sequences treasure hunt
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Made 2 days ago: Enkhuizen city walk in Enkhuizen
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Be the first to create a mathematics treasure huntFeatured this week: example questions for Number Sequences
New example questions from the library every Monday. Updated on 12 October 2026.
How many starlets are there? ⭐
1
2
3
How many red balls do you see? O O
2
1
3
4
How many kittens say meow? Meow, meow!
2
1
3
4
What comes after 1?
2
3
1
4
How many orange lions are there? 1, 2, 3, 4, 5, ?
6
4
7
5
Which number comes before 10?
9
11
8
10
Which number comes after 4?
5
3
6
4
What comes before 5?
4
6
3
5
Look at the sequence: 4, 8, 12, 16. What comes after 16?
20
18
24
17
Which number comes before 6, 7, 8, 9?
5
4
10
7
Which row counts by steps of 1?
4, 5, 6, 7
2, 4, 6, 8
5, 10, 15, 20
3, 6, 9, 12
Which number is missing: 12, 11, 10, ..., 8?
9
7
10
11
Which number is missing: 2, 4, 6, ..., 10?
8
7
9
12
Which number belongs after 18, 17, 16, 15, ...?
14
13
19
16
Which is missing: 19, 18, ..., 16, 15?
17
14
20
13
Start at 8 and count by 2: 8, 10, 12, ... What comes next?
14
13
16
15
What is the next number: 11, 22, 33, 44, ?
55
50
60
45
Which number comes next: 80, 72, 64, 56, ?
48
44
50
46
Which number belongs here: 54, 48, ?, 36, 30
42
40
44
38
Which number does not belong in this sequence: 1, 3, 5, 6, 7, 9
6
3
7
9
Which number is missing: 4, 8, ?, 16, 20
12
10
14
11
Which number comes next: 3, 9, 15, 21, ?
27
25
24
30
What comes next: 33, 30, 27, 24, ?
21
20
22
18
What is missing: 9, 18, ?, 36, 45
27
24
30
25
Which number belongs after 21: 1, 3, 6, 10, 15, 21, ...?
28
27
26
29
Which sequence follows the 'every time +6' rule?
8, 14, 20, 26
8, 12, 16, 20
8, 16, 24, 32
8, 15, 22, 29
Which number is missing from this sequence: 2, 4, 8, ?, 32?
16
12
20
24
What comes after 64 in this sequence: 4, 8, 16, 32, 64, ...?
128
96
120
80
What is the next number: 1, 4, 9, 16, 25, ...?
36
30
35
40
Which sequence shows odd numbers?
1, 3, 5, 7, 9
2, 4, 6, 8, 10
1, 2, 3, 4, 5
5, 10, 15, 20, 25
Which number fits in: 2, 5, 8, 11, ?, 17?
14
13
15
16
What pattern do you see in: 10, 20, 15, 25, 20, 30?
Alternately +10 and -5
Each time +5
Each time +10
Alternately +5 and +10
In the range 256, 128, 64, 32, 16, ... by which number is divided?
2
3
4
1.5
What is the 8th number in the sequence: 5, 11, 17, 23, ...?
47
41
53
45
In the sequence of powers of 3: 3, 9, 27, 81, ... what is the 7th number?
2187
729
6561
1458
Which number comes 7th in the sequence of squares of odd numbers: 1, 9, 25, 49, ...?
169
144
196
121
Which number does NOT fit into this sequence: 1, 4, 9, 16, 24, 36?
24
1
9
36
In the sequence 0.5, 1, 2, 4, 8, ... what is the 8th number?
64
32
128
48
In the sequence 10, 7, 4, 1, -2, ... what is the difference between consecutive numbers?
-3
-4
+3
-2
In which sequence is each number double the previous one plus 1?
1, 3, 7, 15, 31
2, 5, 11, 23, 47
1, 2, 5, 10, 21
3, 7, 15, 31, 63
The sum of the first 10 terms of 2 + 6 + 18 + 54 + ... is:
59048
29524
78730
39365
What is the sum of all even numbers between 50 and 150 (inclusive)?
5100
4950
5250
4800
In the set of twins prime numbers (prime pairs with difference 2), what is the 10th pair?
(41, 43)
(37, 39)
(43, 45)
(47, 49)
Which row has constant 2 as its 2nd difference (difference of differences)?
1, 4, 9, 16, 25, ... (squares)
1, 8, 27, 64, 125, ... (cubes)
2, 6, 12, 20, 30, ...
1, 3, 7, 15, 31, ...
In the harmonic series 1 + 1/2 + 1/3 + 1/4 + ..., what is the sum of the first 4 terms as a fraction?
25/12
23/12
27/12
21/12
The sequence 100, 95, 90, 85, ... has as its 20th term:
5
10
-5
The sum of the geometric sequence 1 + 2 + 4 + 8 + ... + 512 is:
1023
511
1024
512
The sum of the first n squares is n(n+1)(2n+1)/6. What is 1² + 2² + ... + 10²?
385
330
440
365
Which number follows logically in this sequence: 1, 4, 9, 16, 25, ...?
36
35
30
32
In the sequence of Tribonacci numbers (1, 1, 2, 4, 7, 13, 24, ...), what is the next number?
44
37
48
31
In the sequence of perfect numbers, which number comes after 6?
28
12
16
24
In the sequence 5, 11, 23, 47, ... what is the next number?
95
94
96
71
In the sequence 4, 14, 34, 74, 154, ..., what is the next number?
314
234
294
194
What is the 5th number in the sequence of hexagonal numbers (1, 6, 15, 28, ...)?
45
40
50
35
What is the sum of the first 5 terms of the geometric series 2, 6, 18, 54, ...?
242
240
162
324
What is the 7th number in the sequence of pentagonal numbers (1, 5, 12, 22, 35, 51, ...)?
70
68
72
75
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Frequently asked questions
A Number Sequences scavenger hunt is a GPS-guided outdoor activity with quiz questions about Number Sequences, part of the theme Mathematics. You walk a route past various locations and answer fun questions along the way.
There are 2682 questions available about Number Sequences: 2682 multiple choice questions, 0 open questions and 0 assignments. The category Mathematics has more than 49999 questions in total.
There are Number Sequences questions for all ages: from 3-5 years (toddlers) to 20+ (adults). The questions are automatically adapted to the chosen level.
Go to oppatt.io, create a free account, choose the theme Mathematics and select Number Sequences as the topic. Choose an age category and location, and you'll have a complete scavenger hunt within a minute.