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A299760 as a simple table

na(n)
15
27
311
413
517
619
723
829
931
1041
1143
1247
1359
1461
1571
1673
1779
1883
1989
20101
21103
22107
23109
24113
25131
26139
27151
28167
29173
30179
31181
32193
33197
34199
35227
36229
37233
38239
39241
40269
41271
42281
43283
44311
45313
46317
47349
48353
49359
50379
51383
52389
53401
54421
55433
56439
57443
58449
59461
60463
61467
62491
63503
64509
65523
66569
67571
68599
69601
70607

[5,7,11,13,17,19,23,29,31,41,43,47,59,61,71,73,79,
 83,89,101,103,107,109,113,131,139,151,167,173,179,
 181,193,197,199,227,229,233,239,241,269,271,281,
 283,311,313,317,349,353,359,379,383,389,401,421,
 433,439,443,449,461,463,467,491,503,509,523,569,
 571,599,601,607]