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A049554 as a simple table

na(n)
12
27
317
431
541
647
771
873
979
1097
11103
12113
13127
14137
15151
16167
17191
18193
19223
20233
21239
22241
23257
24263
25271
26281
27311
28313
29337
30359
31367
32383
33401
34409
35431
36433
37439
38449
39457
40479
41487
42503
43521
44569
45577
46593
47599
48601
49607
50631
51641
52647
53673
54719

[2,7,17,31,41,47,71,73,79,97,103,113,127,137,151,
 167,191,193,223,233,239,241,257,263,271,281,311,
 313,337,359,367,383,401,409,431,433,439,449,457,
 479,487,503,521,569,577,593,599,601,607,631,641,
 647,673,719]