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A082605 as a simple table

na(n)
02
13
25
311
417
541
665
7161
8257
9641
101025
112561
124097
1310241
1416385
1540961
1665537
17163841
18262145
19655361
201048577
212621441
224194305
2310485761
2416777217
2541943041
2667108865
27167772161
28268435457
29671088641
301073741825
312684354561

[2,3,5,11,17,41,65,161,257,641,1025,2561,4097,
 10241,16385,40961,65537,163841,262145,655361,
 1048577,2621441,4194305,10485761,16777217,
 41943041,67108865,167772161,268435457,671088641,
 1073741825,2684354561]