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A174568 as a simple table

na(n)
12
23
37
419
531
637
779
897
999
10135
11139
12157
13198
14199
15211
16229
17271
18287
19307
20331
21337
22350
23367
24379
25439
26499
27539
28547
29577
30601
31607
32619
33661
34671
35691
36727
37811
38829
39877
40923
41937
42967
43997
441009
451069
461171
471237
481254
491279
501297
511399
521429

[2,3,7,19,31,37,79,97,99,135,139,157,198,199,211,
 229,271,287,307,331,337,350,367,379,439,499,539,
 547,577,601,607,619,661,671,691,727,811,829,877,
 923,937,967,997,1009,1069,1171,1237,1254,1279,
 1297,1399,1429]