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A196670 as a simple table

na(n)
15
27
317
419
531
637
741
843
953
1059
1167
1273
1379
1483
15101
16103
17107
18127
19131
20149
21157
22163
23179
24181
25197
26199
27211
28223
29227
30257
31269
32277
33281
34317
35331
36337
37347
38353
39379
40389
41419
42421
43439
44461
45463
46467
47479
48491
49499
50509
51541
52563
53569
54577
55617

[5,7,17,19,31,37,41,43,53,59,67,73,79,83,101,103,
 107,127,131,149,157,163,179,181,197,199,211,223,
 227,257,269,277,281,317,331,337,347,353,379,389,
 419,421,439,461,463,467,479,491,499,509,541,563,
 569,577,617]