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A069684 as a simple table

na(n)
12
23
35
47
511
613
717
819
923
1029
1131
1237
1341
1443
1547
1653
1759
1861
1967
2071
2173
2279
2383
2489
2597
26191
27193
28197
29199
30293
31397
32491
33499
34593
35599
36691
37797
38991
39997
401993
411997
421999
432999
444993
454999
466991
476997
487993
498999
5019991
5119993
5219997
5349991
5449993
5549999

[2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,
 61,67,71,73,79,83,89,97,191,193,197,199,293,397,
 491,499,593,599,691,797,991,997,1993,1997,1999,
 2999,4993,4999,6991,6997,7993,8999,19991,19993,
 19997,49991,49993,49999]