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A038960 as a simple table

na(n)
13
211
317
423
531
653
767
879
983
1089
1197
12101
13103
14107
15113
16139
17149
18157
19167
20173
21181
22191
23193
24197
25199
26211
27229
28239
29241
30257
31269
32281
33293
34307
35311
36313
37317
38349
39353
40373
41379
42383
43397
44401
45409

[3,11,17,23,31,53,67,79,83,89,97,101,103,107,113,
 139,149,157,167,173,181,191,193,197,199,211,229,
 239,241,257,269,281,293,307,311,313,317,349,353,
 373,379,383,397,401,409]