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A339953 as a simple table

na(n)
15
27
311
413
529
647
767
871
973
1083
11131
12151
13233
14307
15461
16467
17479
18571
19577
20587
21613
22619
23643
24727
25853
26947
27953
28967
29991
301063
311093
321231
331249
341291
351297
361427
371489
381493
391867
401871
411879
422017
432083
442111
452251
462309
472311
482473
492749
502753
512767
523011
533089
543191
553313
563691

[5,7,11,13,29,47,67,71,73,83,131,151,233,307,461,
 467,479,571,577,587,613,619,643,727,853,947,953,
 967,991,1063,1093,1231,1249,1291,1297,1427,1489,
 1493,1867,1871,1879,2017,2083,2111,2251,2309,2311,
 2473,2749,2753,2767,3011,3089,3191,3313,3691]