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A228977 as a simple table

na(n)
13
29
39
427
581
627
781
8729
9729
1081
11243
126387
1319503
146387
15243
16729
1755887
18485397
19485397
2055887
21729
222187
23488037
2411824875
2532175213
2611824875
27488037
282187
296561
304259277
31284888979
322056956837
332056956837
34284888979
354259277
366561

[3,9,9,27,81,27,81,729,729,81,243,6387,19503,6387,
 243,729,55887,485397,485397,55887,729,2187,488037,
 11824875,32175213,11824875,488037,2187,6561,
 4259277,284888979,2056956837,2056956837,284888979,
 4259277,6561]