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A007491 as a simple table

na(n)
12
25
311
417
529
637
753
867
983
10101
11127
12149
13173
14197
15227
16257
17293
18331
19367
20401
21443
22487
23541
24577
25631
26677
27733
28787
29853
30907
31967
321031
331091
341163
351229
361297
371373
381447
391523
401601
411693
421777
431861
441949
452027
462129
472213
482309
492411
502503

[2,5,11,17,29,37,53,67,83,101,127,149,173,197,227,
 257,293,331,367,401,443,487,541,577,631,677,733,
 787,853,907,967,1031,1091,1163,1229,1297,1373,
 1447,1523,1601,1693,1777,1861,1949,2027,2129,2213,
 2309,2411,2503]