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A007802 as a simple table

na(n)
13
25
317
431
5127
6257
7511
8683
92047
102731
113277
123641
138191
1443691
1552429
1661681
1765537
1885489
19131071
20174763
21178481
22233017
23253241
24256999
25486737
26524287
27704093
28838861
291016801
301082401
311657009
321838599
331965379
342304167
352796203
363033169
373303821

[3,5,17,31,127,257,511,683,2047,2731,3277,3641,
 8191,43691,52429,61681,65537,85489,131071,174763,
 178481,233017,253241,256999,486737,524287,704093,
 838861,1016801,1082401,1657009,1838599,1965379,
 2304167,2796203,3033169,3303821]