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A273945 as a simple table

na(n)
15
217
341
4193
5257
612289
759393
865537
9275201
10786433
11790529
128972801
1313631489
1421523361
15134382593
16155189249
17448524289
18524455937
19847036417
203221225473
2112348030977
2222320686081
2377309411329
24206158430209
254638564679681
266597069766657
2712079910333441

[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]