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A165500
as a simple table
n
a(n)
1
1
2
2
3
3
4
2
5
5
6
3
7
7
8
4
9
2
10
5
11
11
12
3
13
13
14
7
15
6
16
2
17
17
18
3
19
19
20
5
21
7
22
11
[1,2,3,2,5,3,7,4,2,5,11,3,13,7,6,2,17,3,19,5,7,11]