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A020480 as a simple table

na(n)
12
213
317
423
541
643
747
867
971
1083
1189
12101
13103
14107
15109
16113
17127
18137
19151
20157
21179
22193
23199
24227
25233
26239
27241
28251
29257
30263
31269
32281
33283
34293
35337
36353
37359
38367
39373
40379
41383
42397
43401
44419
45421
46431
47433
48439
49449
50457
51461
52479
53487
54491
55499
56503
57523

[2,13,17,23,41,43,47,67,71,83,89,101,103,107,109,
 113,127,137,151,157,179,193,199,227,233,239,241,
 251,257,263,269,281,283,293,337,353,359,367,373,
 379,383,397,401,419,421,431,433,439,449,457,461,
 479,487,491,499,503,523]