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A154427 as a simple table

na(n)
13
27
311
423
531
643
759
867
971
10107
11127
12139
13151
14239
15251
16283
17359
18367
19379
20479
21491
22587
23599
24631
25647
26659
27787
28811
29863
30919
31983
32991
331031
341063
351171
361303
371319
381423
391427
401483
411523
421579
431583
441607
451627
461723
471831
481847
491907
501931
511999

[3,7,11,23,31,43,59,67,71,107,127,139,151,239,251,
 283,359,367,379,479,491,587,599,631,647,659,787,
 811,863,919,983,991,1031,1063,1171,1303,1319,1423,
 1427,1483,1523,1579,1583,1607,1627,1723,1831,1847,
 1907,1931,1999]