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A253970 as a simple table

na(n)
12
213
329
443
547
659
7103
8113
9149
10157
11163
12167
13179
14193
15199
16223
17239
18257
19269
20293
21313
22367
23401
24419
25463
26491
27509
28557
29569
30587
31599
32607
33613
34619
35643
36647
37659
38673
39677
40701
41727
42761
43773
44809
45823
46853
47863
48883
49911
50947
51953
52977
531019

[2,13,29,43,47,59,103,113,149,157,163,167,179,193,
 199,223,239,257,269,293,313,367,401,419,463,491,
 509,557,569,587,599,607,613,619,643,647,659,673,
 677,701,727,761,773,809,823,853,863,883,911,947,
 953,977,1019]