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A055387 as a simple table

na(n)
12
23
35
47
513
617
731
837
971
1073
1179
1297
13101
14103
15107
16109
17113
18127
19131
20137
21139
22149
23157
24163
25167
26173
27179
28181
29191
30193
31197
32199
33239
34241
35251
36271
37277
38281
39283
40293
41307
42311
43313
44317
45331
46337
47347
48349
49359
50367
51373
52379
53389
54397
55401
56419
57421

[2,3,5,7,13,17,31,37,71,73,79,97,101,103,107,109,
 113,127,131,137,139,149,157,163,167,173,179,181,
 191,193,197,199,239,241,251,271,277,281,283,293,
 307,311,313,317,331,337,347,349,359,367,373,379,
 389,397,401,419,421]