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A067387
as a simple table
n
a(n)
1
3
2
5
3
17
4
257
5
65537
6
641
7
6700417
8
274177
9
67280421310721
10
59649589127497217
[3,5,17,257,65537,641,6700417,274177, 67280421310721,59649589127497217]