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A008792
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
7
6
11
7
13
8
17
9
19
10
25
11
29
12
31
13
37
14
41
15
43
16
45
17
47
18
53
19
59
20
61
[1,2,3,5,7,11,13,17,19,25,29,31,37,41,43,45,47,53, 59,61]