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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
flagSpain
30%
60%
10%
0%
10
flagGermany
27%
58%
6%
4%
233
flagGreece
35%
57%
7%
0%
14
flagSwitzerland
36%
56%
0%
3%
30
flagIndia
29%
55%
5%
4%
196
flagthe United Kingdom
26%
53%
8%
7%
123
flagGhana
46%
53%
0%
0%
13
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
38%
45%
7%
4%
13692
flagthe United States
32%
44%
7%
8%
280
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%
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