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A256864 as a simple table

na(n)
13
27
313
419
531
641
743
861
971
1083
11103
12109
13131
14137
15139
16151
17157
18167
19179
20193
21197
22199
23223
24229
25241
26257
27271
28281
29283
30311
31337
32349
33383
34421
35433
36439
37461
38463
39487
40503
41523
42547
43571

[3,7,13,19,31,41,43,61,71,83,103,109,131,137,139,
 151,157,167,179,193,197,199,223,229,241,257,271,
 281,283,311,337,349,383,421,433,439,461,463,487,
 503,523,547,571]