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A121502
as a simple table
n
a(n)
1
3
2
4
3
5
4
6
5
8
6
10
7
11
8
12
9
13
10
15
11
22
12
27
13
34
14
46
15
58
16
63
17
70
18
75
19
87
20
128
21
157
22
198
[3,4,5,6,8,10,11,12,13,15,22,27,34,46,58,63,70,75, 87,128,157,198]