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A127928 as a simple table

na(n)
13
27
319
437
543
673
779
897
9109
10127
11151
12163
13181
14199
15223
16241
17271
18277
19307
20313
21331
22349
23367
24379
25397
26421
27439
28457
29487
30523
31541
32547
33601
34613
35619
36631
37673
38691
39709
40727
41757
42811
43829
44853
45883
46907
47937
48997
491009
501033
511051
521069
531087
541117

[3,7,19,37,43,73,79,97,109,127,151,163,181,199,
 223,241,271,277,307,313,331,349,367,379,397,421,
 439,457,487,523,541,547,601,613,619,631,673,691,
 709,727,757,811,829,853,883,907,937,997,1009,1033,
 1051,1069,1087,1117]