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A181516 as a simple table

na(n)
13
27
311
419
523
631
741
847
953
1067
1171
1273
1379
1489
1597
16101
17109
18113
19127
20131
21137
22149
23173
24181
25191
26193
27197
28229
29239
30263
31271
32277
33281
34293
35311
36337
37349
38353
39359
40367
41383
42389
43397
44401
45421
46431
47439
48449
49461
50463
51467
52479
53487
54491
55499

[3,7,11,19,23,31,41,47,53,67,71,73,79,89,97,101,
 109,113,127,131,137,149,173,181,191,193,197,229,
 239,263,271,277,281,293,311,337,349,353,359,367,
 383,389,397,401,421,431,439,449,461,463,467,479,
 487,491,499]