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A047333
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
6
6
8
7
9
8
10
9
12
10
13
11
15
12
16
13
17
14
19
15
20
16
22
17
23
18
24
19
26
20
27
21
29
22
30
23
31
24
33
25
34
[1,2,3,5,6,8,9,10,12,13,15,16,17,19,20,22,23,24, 26,27,29,30,31,33,34]