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A146176
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
13
14
13
15
31
16
31
17
79
18
79
19
513
20
513
21
4397
22
4397
23
30071
24
30071
[1,1,1,1,1,1,1,1,1,1,3,3,13,13,31,31,79,79,513, 513,4397,4397,30071,30071]