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A274903 as a simple table

na(n)
02
15
217
313
4257
541
6241
7113
865537
9109
1061681
112113
12673
131613
1415790321
151321
166700417
1726317
1838737
19525313
204278255361
2114449
222931542417
2330269
2422253377
25268501
26308761441
27279073
2854410972897
29536903681
304562284561
31384773
3267280421310721

[2,5,17,13,257,41,241,113,65537,109,61681,2113,
 673,1613,15790321,1321,6700417,26317,38737,525313,
 4278255361,14449,2931542417,30269,22253377,268501,
 308761441,279073,54410972897,536903681,4562284561,
 384773,67280421310721]