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What is the next number in the sequence? 2,3,5,7,11,13...

15
17
19
21
The sequence 2,3,5,7,11,13 includes prime numbers only. Many people incorrectly select 15, fooled by the fact that all prime numbers except 2 are odd.
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Answers by country

15
17
19
21
answers
flagFrance
10%
84%
0%
5%
19
flagthe Netherlands
20%
75%
5%
0%
20
flagAustralia
21%
68%
2%
7%
38
flagGermany
26%
60%
6%
4%
249
flagSpain
30%
60%
10%
0%
10
flagSwitzerland
35%
58%
0%
3%
31
flagGreece
35%
57%
7%
0%
14
flagIndia
29%
55%
5%
4%
196
flagthe United Kingdom
25%
53%
10%
7%
130
flagGhana
46%
53%
0%
0%
13
flagCanada
33%
51%
7%
3%
27
flagMalaysia
41%
50%
8%
0%
12
flagAustria
37%
47%
15%
0%
40
flagPakistan
26%
46%
6%
20%
15
flagPoland
38%
45%
7%
4%
13744
flagthe United States
32%
45%
7%
8%
287
flagRepublic of Ireland
33%
42%
19%
4%
21
flagUnknown
50%
41%
2%
0%
34
flagthe Philippines
39%
39%
10%
3%
28

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A
B
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10%
25%
50%
None

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