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A028311
as a simple table
n
a(n)
1
5
2
7
3
13
4
17
5
23
6
25
7
29
8
31
9
35
10
37
11
41
12
47
13
49
14
53
15
61
[5,7,13,17,23,25,29,31,35,37,41,47,49,53,61]