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A074938 as a simple table

na(n)
01
13
29
313
427
531
637
739
881
985
1091
1193
12109
13111
14117
15121
16243
17247
18253
19255
20271
21273
22279
23283
24325
25327
26333
27337
28351
29355
30361
31363
32729
33733
34739
35741
36757
37759
38765
39769
40811
41813
42819
43823
44837
45841
46847
47849
48973
49975
50981
51985
52999
531003
541009

[1,3,9,13,27,31,37,39,81,85,91,93,109,111,117,121,
 243,247,253,255,271,273,279,283,325,327,333,337,
 351,355,361,363,729,733,739,741,757,759,765,769,
 811,813,819,823,837,841,847,849,973,975,981,985,
 999,1003,1009]