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A280963 as a simple table

na(n)
11
23
39
415
527
675
781
899
9243
10255
11315
12375
13729
14783
151089
161875
172187
184335
196561
206723
219375
229999
2311979
2419683
2522707
2646875
2759049
2865535
2973695
3099855
31131769
32177147
33234375
34531441
35558009
36658503
371009899
381171875
391188099
401252815
411449459
421594323

[1,3,9,15,27,75,81,99,243,255,315,375,729,783,
 1089,1875,2187,4335,6561,6723,9375,9999,11979,
 19683,22707,46875,59049,65535,73695,99855,131769,
 177147,234375,531441,558009,658503,1009899,
 1171875,1188099,1252815,1449459,1594323]