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A117249 as a simple table

na(n)
15
27
313
419
537
643
761
871
989
10113
11131
12163
13181
14193
15223
16251
17281
18293
19337
20359
21373
22409
23433
24463
25521
26557
27569
28593
29601
30619
31719
32743
33787
34809
35863
36881
37929
38971
39997
401033
411069
421091
431163
441181
451213
461223
471301
481423
491439
501451
511481
521511
531531
541601
551627
561693
571733
581747
591789
601831
611861
621931

[5,7,13,19,37,43,61,71,89,113,131,163,181,193,223,
 251,281,293,337,359,373,409,433,463,521,557,569,
 593,601,619,719,743,787,809,863,881,929,971,997,
 1033,1069,1091,1163,1181,1213,1223,1301,1423,1439,
 1451,1481,1511,1531,1601,1627,1693,1733,1747,1789,
 1831,1861,1931]