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A067870 as a simple table

na(n)
17
213
327
433
547
653
767
873
987
1093
11107
12113
13127
14133
15147
16153
17167
18173
19187
20193
21207
22213
23227
24233
25247
26253
27267
28273
29287
30293
31307
32313
33327
34333
35347
36353
37367
38373
39387
40393
41407
42413
43427
44433
45447
46453
47467
48473
49487
50493
51507
52513
53527
54533

[7,13,27,33,47,53,67,73,87,93,107,113,127,133,147,
 153,167,173,187,193,207,213,227,233,247,253,267,
 273,287,293,307,313,327,333,347,353,367,373,387,
 393,407,413,427,433,447,453,467,473,487,493,507,
 513,527,533]