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A018541
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
8
8
10
9
12
10
15
11
20
12
24
13
25
14
30
15
40
16
50
17
60
18
75
19
100
20
120
21
150
22
200
23
300
24
600
[1,2,3,4,5,6,8,10,12,15,20,24,25,30,40,50,60,75, 100,120,150,200,300,600]