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A186815 as a simple table

na(n)
19
221
327
439
551
669
781
887
999
10117
11129
12147
13153
14171
15177
16183
17207
18219
19249
20261
21309
22333
23351
24363
25387
26393
27399
28429
29441
30447
31459
32471
33477
34483
35519
36537
37561
38597
39609
40621
41633
42639
43651
44663
45687
46711
47717
48723
49741
50753
51777
52807
53849

[9,21,27,39,51,69,81,87,99,117,129,147,153,171,
 177,183,207,219,249,261,309,333,351,363,387,393,
 399,429,441,447,459,471,477,483,519,537,561,597,
 609,621,633,639,651,663,687,711,717,723,741,753,
 777,807,849]