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A273946 as a simple table

na(n)
13
213
317
4257
5313
6641
7769
82593
911489
1019457
1165537
12163841
13786433
141503233
151655809
167340033
1714155777
1818395137
1923606273
2029423041
2139714817
2275068993
23167772161
242483027969
254643094529
266616514561
2747148957697
28241931001601
292748779069441

[3,13,17,257,313,641,769,2593,11489,19457,65537,
 163841,786433,1503233,1655809,7340033,14155777,
 18395137,23606273,29423041,39714817,75068993,
 167772161,2483027969,4643094529,6616514561,
 47148957697,241931001601,2748779069441]