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A240838 as a simple table

na(n)
12
23
35
413
541
643
7139
8173
9227
10239
11359
12463
13541
14691
15743
16761
17821
18823
19827
20887
211021
221117
231289
241427
251489
261637
271723
281933
291999
302081
312287
322309
332719
342791
352833
362843
372953
383329
393541
403803
413823
423929
434003
444007
454079
464139
474297
484451
494561
504597
514691
524703
534817
544931
554943

[2,3,5,13,41,43,139,173,227,239,359,463,541,691,
 743,761,821,823,827,887,1021,1117,1289,1427,1489,
 1637,1723,1933,1999,2081,2287,2309,2719,2791,2833,
 2843,2953,3329,3541,3803,3823,3929,4003,4007,4079,
 4139,4297,4451,4561,4597,4691,4703,4817,4931,4943]