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A268476 as a simple table

na(n)
15
211
313
417
519
623
729
847
959
1061
1167
1271
1379
1497
15103
16113
17131
18149
19173
20181
21191
22193
23199
24223
25227
26239
27241
28251
29257
30263
31271
32277
33293
34331
35337
36347
37349
38373
39383
40421
41449
42463
43479
44487
45499
46503
47509
48557
49587
50593
51599
52601
53613
54617
55619

[5,11,13,17,19,23,29,47,59,61,67,71,79,97,103,113,
 131,149,173,181,191,193,199,223,227,239,241,251,
 257,263,271,277,293,331,337,347,349,373,383,421,
 449,463,479,487,499,503,509,557,587,593,599,601,
 613,617,619]