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A024768 as a simple table

na(n)
12
23
35
47
521
623
727
835
937
1051
1153
1257
1373
1475
15211
16213
17235
18277
19351
20357
21373
22513
23533
24535
25573
26577
27737
28753
292111
302117
312135
322353
332773
343513
353517
363571
373733
385331
395355
405735
415773
427371
437531
447533
4521113
4621117
4721177
4821355
4923537
5027733

[2,3,5,7,21,23,27,35,37,51,53,57,73,75,211,213,
 235,277,351,357,373,513,533,535,573,577,737,753,
 2111,2117,2135,2353,2773,3513,3517,3571,3733,5331,
 5355,5735,5773,7371,7531,7533,21113,21117,21177,
 21355,23537,27733]