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A291049 as a simple table

na(n)
12
23
35
417
5137
6257
765537
8157217
9295937
10557057
111336337
1296550277
131212153857
142281701377
155473632257
16395469930497
171401249857537
182637646790657
194964982194177
2028572702478337
211271035441709057
2238280596832649217
231872540629620228097
246634884445436379137

[2,3,5,17,137,257,65537,157217,295937,557057,
 1336337,96550277,1212153857,2281701377,5473632257,
 395469930497,1401249857537,2637646790657,
 4964982194177,28572702478337,1271035441709057,
 38280596832649217,1872540629620228097,
 6634884445436379137]