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A068486 as a simple table

na(n)
12
25
313
417
529
637
753
873
997
10101
11137
12193
13173
14197
15229
16257
17293
18349
19397
20401
21457
22509
23593
24577
25641
26677
27733
28809
29857
301021
31977
321033
331093
341181
351229
361297
371373
381453
391621
401601
411697
421789
431913
442017
452029
462141
472213
482473
492417
502549

[2,5,13,17,29,37,53,73,97,101,137,193,173,197,229,
 257,293,349,397,401,457,509,593,577,641,677,733,
 809,857,1021,977,1033,1093,1181,1229,1297,1373,
 1453,1621,1601,1697,1789,1913,2017,2029,2141,2213,
 2473,2417,2549]