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A143015
as a simple table
n
a(n)
1
1
2
3
3
3
4
3
5
7
6
13
7
5
8
13
9
57
10
223
11
5419
12
17
13
241
14
4192257
15
16773121
16
17
17
241
[1,3,3,3,7,13,5,13,57,223,5419,17,241,4192257, 16773121,17,241]