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A338552 as a simple table

na(n)
121
239
357
463
565
687
791
8111
9115
10117
11129
12133
13147
14159
15171
16183
17185
18189
19203
20213
21235
22237
23247
24259
25261
26267
27273
28299
29301
30303
31305
32319
33321
34325
35333
36339
37351
38365
39371
40377
41387
42393
43399
44417
45427
46441
47445
48453
49477
50481
51489
52497
53507

[21,39,57,63,65,87,91,111,115,117,129,133,147,159,
 171,183,185,189,203,213,235,237,247,259,261,267,
 273,299,301,303,305,319,321,325,333,339,351,365,
 371,377,387,393,399,417,427,441,445,453,477,481,
 489,497,507]