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A260476
as a simple table
n
a(n)
1
3
2
5
3
17
4
257
5
65537
6
285121
7
1425601
8
2380801
9
100638721
10
8778792961
11
184354652161
[3,5,17,257,65537,285121,1425601,2380801, 100638721,8778792961,184354652161]