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A002587 as a simple table

na(n)
02
13
25
33
417
511
613
743
8257
919
1041
11683
12241
132731
14113
15331
1665537
1743691
18109
19174763
2061681
215419
222113
232796203
24673
254051
261613
2787211
2815790321
293033169
301321
31715827883
326700417
3320857
3426317
3586171
3638737
3725781083
38525313

[2,3,5,3,17,11,13,43,257,19,41,683,241,2731,113,
 331,65537,43691,109,174763,61681,5419,2113,
 2796203,673,4051,1613,87211,15790321,3033169,1321,
 715827883,6700417,20857,26317,86171,38737,
 25781083,525313]