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A186969
as a simple table
n
a(n)
1
3
2
5
3
5
4
4259
5
25409
6
25409
7
512819
8
512819
9
17733438029
10
1095010766849
11
766405913232959
[3,5,5,4259,25409,25409,512819,512819,17733438029, 1095010766849,766405913232959]