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A105676
as a simple table
n
a(n)
1
3
2
3
3
6
4
6
5
6
6
9
7
9
8
9
9
12
10
12
11
12
12
15
13
15
14
15
15
18
16
18
[3,3,6,6,6,9,9,9,12,12,12,15,15,15,18,18]