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A243706 as a simple table

na(n)
13
27
313
417
547
653
767
897
9137
10157
11167
12193
13227
14233
15257
16263
17293
18313
19317
20347
21383
22397
23457
24463
25503
26547
27557
28563
29577
30587
31593
32643
33653
34673
35683
36727
37757
38773
39823
40827
41883
42887
43937
44967
45977
46997
471013
481063
491093

[3,7,13,17,47,53,67,97,137,157,167,193,227,233,
 257,263,293,313,317,347,383,397,457,463,503,547,
 557,563,577,587,593,643,653,673,683,727,757,773,
 823,827,883,887,937,967,977,997,1013,1063,1093]