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A215381 as a simple table

na(n)
12
23
319
441
559
679
797
8173
9191
10193
11211
12229
13269
14307
15383
16401
17419
18421
19439
20457
21571
22647
23743
24761
25839
26857
27877
28953
29971
30991
311009
321103
331123
341181
351217
361237
371409
381427
391447
401483
411523
421559
431579
441597
451637
461693
471787
481789
491901
501979

[2,3,19,41,59,79,97,173,191,193,211,229,269,307,
 383,401,419,421,439,457,571,647,743,761,839,857,
 877,953,971,991,1009,1103,1123,1181,1217,1237,
 1409,1427,1447,1483,1523,1559,1579,1597,1637,1693,
 1787,1789,1901,1979]