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A020628
as a simple table
n
a(n)
1
3
2
5
3
7
4
11
5
13
6
17
7
23
8
41
9
43
10
53
11
71
12
79
13
83
14
127
15
131
16
151
17
239
18
251
19
383
20
691
21
719
22
1151
[3,5,7,11,13,17,23,41,43,53,71,79,83,127,131,151, 239,251,383,691,719,1151]