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A057948 as a simple table

na(n)
15
29
313
417
521
629
733
837
941
1049
1153
1257
1361
1469
1573
1677
1789
1893
1997
20101
21109
22113
23121
24129
25133
26137
27141
28149
29157
30161
31173
32177
33181
34193
35197
36201
37209
38213
39217
40229
41233
42237
43241
44249
45253
46257
47269
48277
49281
50293
51301
52309
53313
54317
55321
56329

[5,9,13,17,21,29,33,37,41,49,53,57,61,69,73,77,89,
 93,97,101,109,113,121,129,133,137,141,149,157,161,
 173,177,181,193,197,201,209,213,217,229,233,237,
 241,249,253,257,269,277,281,293,301,309,313,317,
 321,329]