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A028748
as a simple table
n
a(n)
1
2
2
3
3
5
4
6
5
7
6
8
7
10
8
12
9
13
10
17
11
18
12
19
13
20
14
22
15
23
16
24
17
26
18
27
19
28
20
31
21
32
22
33
23
34
[2,3,5,6,7,8,10,12,13,17,18,19,20,22,23,24,26,27, 28,31,32,33,34]