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A188509
as a simple table
n
a(n)
1
1
2
1
3
3
4
1
5
5
6
7
7
1
8
9
9
13
10
15
11
1
12
17
13
25
14
29
15
31
16
1
17
33
18
49
19
57
20
61
21
63
22
1
23
65
[1,1,3,1,5,7,1,9,13,15,1,17,25,29,31,1,33,49,57, 61,63,1,65]