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A175120 as a simple table

na(n)
12
27
317
443
553
679
789
8139
9149
10199
11227
12263
13313
14347
15373
16383
17409
18419
19541
20557
21593
22619
23641
24677
25727
26743
27769
28797
29823
30839
31983
321009
331019
341069
351091
361117
371151
381187
391213
401223
411249
421259
431381
441409
451459
461481
471531
481553
491579
501601

[2,7,17,43,53,79,89,139,149,199,227,263,313,347,
 373,383,409,419,541,557,593,619,641,677,727,743,
 769,797,823,839,983,1009,1019,1069,1091,1117,1151,
 1187,1213,1223,1249,1259,1381,1409,1459,1481,1531,
 1553,1579,1601]