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A059809
as a simple table
n
a(n)
1
2
2
3
3
4
4
5
5
6
6
8
7
10
8
12
9
14
10
18
11
20
12
24
13
32
14
48
15
60
16
72
17
168
18
720
[2,3,4,5,6,8,10,12,14,18,20,24,32,48,60,72,168, 720]