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A386114 as a simple table

na(n)
13
27
311
413
517
631
737
861
967
1071
1173
12113
13131
14137
15163
16167
17173
18311
19313
20317
21331
22337
23367
24373
25613
26617
27631
28661
29673
30677
31733
32761
33773
341117
351163
361171
371361
381367
391373
401613
411637
421663
431667
441733
451777
463137
473163
483167
493313
503331
513361

[3,7,11,13,17,31,37,61,67,71,73,113,131,137,163,
 167,173,311,313,317,331,337,367,373,613,617,631,
 661,673,677,733,761,773,1117,1163,1171,1361,1367,
 1373,1613,1637,1663,1667,1733,1777,3137,3163,3167,
 3313,3331,3361]