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A038881 as a simple table

na(n)
15
27
311
419
537
643
753
879
983
1089
1197
12107
13113
14127
15131
16137
17139
18151
19157
20167
21181
22211
23227
24229
25239
26257
27263
28269
29271
30283
31307
32313
33317
34347
35353
36359
37389
38397
39401
40421
41431
42433
43439
44449
45479
46491
47503
48509
49521
50523
51547
52563
53571
54577

[5,7,11,19,37,43,53,79,83,89,97,107,113,127,131,
 137,139,151,157,167,181,211,227,229,239,257,263,
 269,271,283,307,313,317,347,353,359,389,397,401,
 421,431,433,439,449,479,491,503,509,521,523,547,
 563,571,577]