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A154274 as a simple table

na(n)
12
23
317
419
571
697
7127
8131
9139
10191
11193
12227
13229
14251
15281
16337
17349
18353
19389
20443
21503
22541
23557
24563
25571
26613
27659
28701
29719
30727
31743
32877
33911
34971
351031
361087
371091
381103
391217
401297
411301
421409
431439
441451
451481
461531
471549
481657
491697
501741

[2,3,17,19,71,97,127,131,139,191,193,227,229,251,
 281,337,349,353,389,443,503,541,557,563,571,613,
 659,701,719,727,743,877,911,971,1031,1087,1091,
 1103,1217,1297,1301,1409,1439,1451,1481,1531,1549,
 1657,1697,1741]