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A280266 as a simple table

na(n)
15
27
313
419
531
637
743
847
953
1061
1173
1279
1389
1497
15137
16151
17167
18173
19193
20199
21223
22229
23241
24251
25271
26349
27353
28367
29379
30383
31409
32439
33457
34463
35487
36503
37521
38523
39587
40593
41619
42643
43647
44653
45727
46787
47797
48809
49829
50853
51859
52937

[5,7,13,19,31,37,43,47,53,61,73,79,89,97,137,151,
 167,173,193,199,223,229,241,251,271,349,353,367,
 379,383,409,439,457,463,487,503,521,523,587,593,
 619,643,647,653,727,787,797,809,829,853,859,937]