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A268109
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
11
6
13
7
17
8
19
9
23
10
29
11
31
12
41
13
647
14
1277
15
1979
16
2753
[2,3,5,7,11,13,17,19,23,29,31,41,647,1277,1979, 2753]