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A002586 as a simple table

na(n)
13
25
33
417
53
65
73
8257
93
105
113
1217
133
145
153
1665537
173
185
193
2017
213
225
233
2497
253
265
273
2817
293
305
313
32641
333
345
353
3617
373
385
393
40257
413
425
433
4417
453
465
473
48193
493
505
513
5217
533
545
553
56257
573
585
593
6017
613
625
633
64274177
653
665
673
6817
693
705
713
7297
733
745
753
7617
773
785
793
8065537
813
825
833
8417
853
865

[3,5,3,17,3,5,3,257,3,5,3,17,3,5,3,65537,3,5,3,17,
 3,5,3,97,3,5,3,17,3,5,3,641,3,5,3,17,3,5,3,257,3,
 5,3,17,3,5,3,193,3,5,3,17,3,5,3,257,3,5,3,17,3,5,
 3,274177,3,5,3,17,3,5,3,97,3,5,3,17,3,5,3,65537,3,
 5,3,17,3,5]