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A082897 as a simple table

na(n)
13
29
315
427
539
681
7111
8183
9243
10255
11327
12363
13471
14729
152187
162199
173063
184359
194375
205571
216561
228751
2315723
2419683
2536759
2646791
2759049
2865535
29140103
30177147
31208191
32441027
33531441
341594323
354190263
364782969
379056583
3814348907
3943046721

[3,9,15,27,39,81,111,183,243,255,327,363,471,729,
 2187,2199,3063,4359,4375,5571,6561,8751,15723,
 19683,36759,46791,59049,65535,140103,177147,
 208191,441027,531441,1594323,4190263,4782969,
 9056583,14348907,43046721]