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A247200 as a simple table

na(n)
171
299
3101
4109
5131
6139
7155
8169
9181
10197
11199
12221
13229
14239
15241
16251
17259
18265
19281
20287
21289
22307
23309
24311
25323
26337
27339
28341
29349
30365
31371
32373
33379
34391
35401
36407
37409
38419
39431
40433
41439
42441
43443
44461
45469
46475
47485
48491
49493
50499
51505
52517
53519

[71,99,101,109,131,139,155,169,181,197,199,221,
 229,239,241,251,259,265,281,287,289,307,309,311,
 323,337,339,341,349,365,371,373,379,391,401,407,
 409,419,431,433,439,441,443,461,469,475,485,491,
 493,499,505,517,519]