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A260427 as a simple table

na(n)
15
217
323
429
543
653
769
871
977
1079
1181
1283
1389
14101
15107
16113
17121
18127
19139
20149
21151
22163
23169
24173
25179
26181
27197
28199
29205
30209
31223
32227
33233
34251
35257
36261
37263
38265
39269
40271
41275
42277
43281
44289
45293
46295
47305
48307
49311
50317
51321
52323
53327
54329
55331
56337
57339
58347
59349
60353
61359
62367
63373
64377
65383
66389
67401

[5,17,23,29,43,53,69,71,77,79,81,83,89,101,107,
 113,121,127,139,149,151,163,169,173,179,181,197,
 199,205,209,223,227,233,251,257,261,263,265,269,
 271,275,277,281,289,293,295,305,307,311,317,321,
 323,327,329,331,337,339,347,349,353,359,367,373,
 377,383,389,401]