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A256072 as a simple table

na(n)
12
23
35
47
513
637
761
873
9157
10193
11277
12313
13397
14421
15457
16541
17613
18661
19673
20733
21757
22877
23997
241093
251153
261201
271213
281237
291321
301381
311453
321621
331657
341753
351873
361933
371993
382017
392137
402341
412473
422557
432593
442797
452857
462917
473061
483217
493253
503313

[2,3,5,7,13,37,61,73,157,193,277,313,397,421,457,
 541,613,661,673,733,757,877,997,1093,1153,1201,
 1213,1237,1321,1381,1453,1621,1657,1753,1873,1933,
 1993,2017,2137,2341,2473,2557,2593,2797,2857,2917,
 3061,3217,3253,3313]