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A129521 as a simple table

na(n)
16
215
391
4703
51891
62701
712403
818721
938503
1049141
1179003
1288831
13104653
14146611
15188191
16218791
17226801
18269011
19286903
20385003
21497503
22597871
23665281
24721801
25736291
26765703
27873181
28954271
291056331
301314631
311373653
321537381

[6,15,91,703,1891,2701,12403,18721,38503,49141,
 79003,88831,104653,146611,188191,218791,226801,
 269011,286903,385003,497503,597871,665281,721801,
 736291,765703,873181,954271,1056331,1314631,
 1373653,1537381]