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A028756
as a simple table
n
a(n)
1
2
2
3
3
5
4
7
5
8
6
12
7
18
8
19
9
20
10
22
11
26
12
27
13
28
14
29
15
30
16
32
17
33
18
34
19
37
20
39
21
42
[2,3,5,7,8,12,18,19,20,22,26,27,28,29,30,32,33,34, 37,39,42]