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A068652 as a simple table

na(n)
12
23
35
47
511
613
717
831
937
1071
1173
1279
1397
14113
15131
16197
17199
18311
19337
20373
21719
22733
23919
24971
25991
261193
271931
283119
293779
307793
317937
329311
339377
3411939
3519391
3619937
3737199
3839119
3971993
4091193
4193719
4293911
4399371
44193939
45199933
46319993

[2,3,5,7,11,13,17,31,37,71,73,79,97,113,131,197,
 199,311,337,373,719,733,919,971,991,1193,1931,
 3119,3779,7793,7937,9311,9377,11939,19391,19937,
 37199,39119,71993,91193,93719,93911,99371,193939,
 199933,319993]