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A115591 as a simple table

na(n)
17
217
323
441
547
671
779
897
9103
10137
11167
12191
13193
14199
15239
16263
17271
18311
19313
20359
21367
22383
23401
24409
25449
26463
27479
28487
29503
30521
31569
32599
33607
34647
35719
36743
37751
38761
39769
40809
41823
42839
43857
44863
45887
46929
47967
48977
49983
50991
511009
521031

[7,17,23,41,47,71,79,97,103,137,167,191,193,199,
 239,263,271,311,313,359,367,383,401,409,449,463,
 479,487,503,521,569,599,607,647,719,743,751,761,
 769,809,823,839,857,863,887,929,967,977,983,991,
 1009,1031]