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A249589 as a simple table

na(n)
15
217
319
421
523
627
729
831
933
1039
1149
1251
1353
1469
1571
1677
1779
1887
1991
2097
21143
22147
23151
24157
25159
26163
27171
28173
29187
30191
31199
32201
33229
34231
35233
36239
37241
38243
39247
40251
41267
42279
43283
44293
45297
46301
47321
48333
49351
50357
51363
52369
53381
54393
55423
56447
57449
58453
59457
60463
61467
62469
63471
64477
65483
66491
67493
68501
69511
70517
71523

[5,17,19,21,23,27,29,31,33,39,49,51,53,69,71,77,
 79,87,91,97,143,147,151,157,159,163,171,173,187,
 191,199,201,229,231,233,239,241,243,247,251,267,
 279,283,293,297,301,321,333,351,357,363,369,381,
 393,423,447,449,453,457,463,467,469,471,477,483,
 491,493,501,511,517,523]