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A238476 as a simple table

na(n)
13
27
313
411
529
653
715
845
9117
10213
1119
1261
13181
14469
15853
1623
1777
18245
19725
201877
213413
2227
2393
24309
25981
262901
277509
2813653
2931
30109
31373
321237
333925
3411605
3530037
3654613
3735
38125
39437
401493
414949
4215701
4346421
44120149
45218453

[3,7,13,11,29,53,15,45,117,213,19,61,181,469,853,
 23,77,245,725,1877,3413,27,93,309,981,2901,7509,
 13653,31,109,373,1237,3925,11605,30037,54613,35,
 125,437,1493,4949,15701,46421,120149,218453]