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A171271 as a simple table

na(n)
13
25
317
4155
5257
6287
7365
8805
91067
102147
113383
124551
136107
147701
158177
169269
1711285
1812557
1912971
2016403
2119229
2219277
2320273
2425133
2526405
2627347
2729155
2829575
2935645
3036419
3138369
3239647
3340495
3447215
3552235
3654653
3765537
3884863

[3,5,17,155,257,287,365,805,1067,2147,3383,4551,
 6107,7701,8177,9269,11285,12557,12971,16403,19229,
 19277,20273,25133,26405,27347,29155,29575,35645,
 36419,38369,39647,40495,47215,52235,54653,65537,
 84863]