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A175445 as a simple table

na(n)
12
27
311
443
547
661
783
897
9101
10151
11173
12223
13227
14241
15263
16277
17281
18313
19317
20331
21353
22367
23389
24421
25443
26457
27461
28547
29569
30601
31641
32673
33677
34691
35821
36853
37857
38907
39911
40997
411019
421033
431091
441123
451163
461213
471217
481231
491289
501303
511307

[2,7,11,43,47,61,83,97,101,151,173,223,227,241,
 263,277,281,313,317,331,353,367,389,421,443,457,
 461,547,569,601,641,673,677,691,821,853,857,907,
 911,997,1019,1033,1091,1123,1163,1213,1217,1231,
 1289,1303,1307]