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A339988 as a simple table

na(n)
15
217
337
461
573
689
7101
8109
9113
10149
11181
12193
13197
14257
15277
16281
17317
18337
19349
20373
21401
22409
23449
24509
25521
26569
27577
28601
29613
30653
31677
32701
33709
34757
35761
36773
37797
38809
39937
40953
411009
421021
431033
441049
451069
461117
471181
481193
491237
501249
511277
521297
531301

[5,17,37,61,73,89,101,109,113,149,181,193,197,257,
 277,281,317,337,349,373,401,409,449,509,521,569,
 577,601,613,653,677,701,709,757,761,773,797,809,
 937,953,1009,1021,1033,1049,1069,1117,1181,1193,
 1237,1249,1277,1297,1301]