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A337941
as a simple table
n
a(n)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
11
11
12
12
15
13
24
14
1111111111111111111
15
11111111111111111111111
[1,2,3,4,5,6,7,8,9,11,12,15,24, 1111111111111111111,11111111111111111111111]