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A028766
as a simple table
n
a(n)
1
2
2
3
3
5
4
8
5
12
6
14
7
18
8
19
9
20
10
21
11
22
12
23
13
26
14
27
15
30
16
31
17
32
18
33
19
34
20
35
21
39
22
41
23
45
24
48
25
50
26
51
[2,3,5,8,12,14,18,19,20,21,22,23,26,27,30,31,32, 33,34,35,39,41,45,48,50,51]