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A089388
as a simple table
n
a(n)
1
2
2
3
3
4
4
6
5
7
6
9
7
13
8
15
9
16
10
18
11
21
12
22
13
25
14
28
15
34
16
39
17
42
18
51
19
55
20
58
21
60
22
63
23
67
24
70
25
72
[2,3,4,6,7,9,13,15,16,18,21,22,25,28,34,39,42,51, 55,58,60,63,67,70,72]