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A066845 as a simple table

na(n)
13
25
33
417
511
613
743
8257
957
10205
11683
12241
132731
143277
15331
1665537
1743691
184033
19174763
2061681
215419
22838861
232796203
2465281
251016801
2613421773
27261633
2815790321
29178956971
3080581
31715827883
324294967297
331397419
343435973837

[3,5,3,17,11,13,43,257,57,205,683,241,2731,3277,
 331,65537,43691,4033,174763,61681,5419,838861,
 2796203,65281,1016801,13421773,261633,15790321,
 178956971,80581,715827883,4294967297,1397419,
 3435973837]