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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
17%
71%
2%
8%
35
flagGermany
28%
58%
6%
3%
227
flagGreece
35%
57%
7%
0%
14
flagIndia
29%
55%
5%
4%
196
flagSwitzerland
37%
55%
0%
3%
29
flagthe United Kingdom
27%
53%
9%
7%
122
flagCanada
33%
51%
7%
3%
27
flagMalaysia
41%
50%
8%
0%
12
flagAustria
38%
46%
15%
0%
39
flagPakistan
26%
46%
6%
20%
15
flagPoland
39%
45%
7%
4%
13651
flagGhana
54%
45%
0%
0%
11
flagthe United States
33%
42%
7%
8%
272
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%
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50%
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