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A273945 as a simple table

n a(n)
1 5
2 17
3 41
4 193
5 257
6 12289
7 59393
8 65537
9 275201
10 786433
11 790529
12 8972801
13 13631489
14 21523361
15 134382593
16 155189249
17 448524289
18 524455937
19 847036417
20 3221225473
21 12348030977
22 22320686081
23 77309411329
24 206158430209
25 4638564679681
26 6597069766657
27 12079910333441

[5,17,41,193,257,12289,59393,65537,275201,786433,
 790529,8972801,13631489,21523361,134382593,
 155189249,448524289,524455937,847036417,
 3221225473,12348030977,22320686081,77309411329,
 206158430209,4638564679681,6597069766657,
 12079910333441]

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Last modified February 23 16:15 EST 2020. Contains 332174 sequences. (Running on oeis4.)