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A242025
as a simple table
n
a(n)
1
5
2
17
3
29
4
41
5
2729
6
8737
7
65537
8
74897
9
174761
10
715827881
11
153722867280912929
12
302379100949042568368129
[5,17,29,41,2729,8737,65537,74897,174761, 715827881,153722867280912929, 302379100949042568368129]