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A038879 as a simple table

na(n)
12
23
35
413
531
637
741
843
953
1067
1171
1279
1383
1489
15107
16151
17157
18163
19173
20191
21197
22199
23227
24239
25241
26271
27277
28281
29283
30293
31307
32311
33317
34347
35359
36373
37397
38401
39409
40431
41439
42443
43449
44467
45479
46521

[2,3,5,13,31,37,41,43,53,67,71,79,83,89,107,151,
 157,163,173,191,197,199,227,239,241,271,277,281,
 283,293,307,311,317,347,359,373,397,401,409,431,
 439,443,449,467,479,521]