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A239036
as a simple table
n
a(n)
1
3
2
5
3
7
4
9
5
11
6
13
7
23
8
721
9
979011
10
175878510309
11
20622166925499467673345
[3,5,7,9,11,13,23,721,979011,175878510309, 20622166925499467673345]