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A006075
as a simple table
n
a(n)
1
1
2
4
3
4
4
4
5
5
6
8
7
10
8
12
9
14
10
16
11
21
12
24
13
28
14
32
15
36
16
40
17
46
18
52
19
57
20
62
21
68
[1,4,4,4,5,8,10,12,14,16,21,24,28,32,36,40,46,52, 57,62,68]