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A136051as a simple table

na(n)
13
27
313
431
537
643
767
8109
9127
10139
11151
12163
13199
14211
15241
16277
17307
18349
19367
20373
21433
22457
23463
24547
25571
26601
27613
28661
29673
30709
31727
32739
33787
34811
35823
36853
37919
38967
39991
401021
411087
421117
431129
441171
451231
461291
471297
481399
491471
501483
511549

[3,7,13,31,37,43,67,109,127,139,151,163,199,211,
241,277,307,349,367,373,433,457,463,547,571,601,
613,661,673,709,727,739,787,811,823,853,919,967,
991,1021,1087,1117,1129,1171,1231,1291,1297,1399,
1471,1483,1549]