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A068669
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
7
6
11
7
13
8
17
9
23
10
31
11
37
12
53
13
71
14
73
15
113
16
131
17
137
18
173
19
311
20
313
21
317
22
373
23
1373
24
3137
[1,2,3,5,7,11,13,17,23,31,37,53,71,73,113,131,137, 173,311,313,317,373,1373,3137]