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A208574 as a simple table

na(n)
13
25
311
417
529
641
759
871
9101
10137
11197
12269
13419
14521
15809
161031
171607
182081
193119
204127
216197
228219
2312377
2416451
2524917
2632801
2749169
2865537
2998321
30131111
31196661
32262151
33393299
34524351
35786551
361048889
371572869
382097257
393145739
404194581
416292007

[3,5,11,17,29,41,59,71,101,137,197,269,419,521,
 809,1031,1607,2081,3119,4127,6197,8219,12377,
 16451,24917,32801,49169,65537,98321,131111,196661,
 262151,393299,524351,786551,1048889,1572869,
 2097257,3145739,4194581,6292007]