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A146812
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
1
10
1
11
3
12
3
13
7
14
7
15
19
16
19
17
47
18
47
19
187
20
187
21
1053
22
1053
[1,1,1,1,1,1,1,1,1,1,3,3,7,7,19,19,47,47,187,187, 1053,1053]