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A156980 as a simple table

na(n)
12
213
331
453
579
697
7103
8163
9233
10251
11277
12349
13367
14383
15389
16433
17439
18457
19479
20503
21521
22547
23563
24569
25613
26619
27631
28653
29659
30673
31691
32709
33727
34839
35907
36929
37947
38983
391063
401069
411151
421223
431249
441283
451289
461423
471429
481447
491481
501511

[2,13,31,53,79,97,103,163,233,251,277,349,367,383,
 389,433,439,457,479,503,521,547,563,569,613,619,
 631,653,659,673,691,709,727,839,907,929,947,983,
 1063,1069,1151,1223,1249,1283,1289,1423,1429,1447,
 1481,1511]