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A028755
as a simple table
n
a(n)
1
2
2
3
3
5
4
6
5
8
6
10
7
11
8
12
9
13
10
14
11
17
12
19
13
20
14
23
15
24
16
26
17
27
18
29
19
31
20
32
21
33
22
34
23
35
24
38
25
40
26
41
[2,3,5,6,8,10,11,12,13,14,17,19,20,23,24,26,27,29, 31,32,33,34,35,38,40,41]