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A165978 as a simple table

na(n)
12
27
371
479
5113
629
797
8971
983
10277
11163
12233
1337
1453
1559
16197
1773
1843
19431
20479
211597
2215971
23383
241277
2543
26431
27479
281597
2915971
30383
311277
3243
33431
34479
351597
3615971
37383
381277
3943
40431
41479
421597
4315971
44383
451277
4643
47431
48479
491597
5015971
51383
521277

[2,7,71,79,113,29,97,971,83,277,163,233,37,53,59,
 197,73,43,431,479,1597,15971,383,1277,43,431,479,
 1597,15971,383,1277,43,431,479,1597,15971,383,
 1277,43,431,479,1597,15971,383,1277,43,431,479,
 1597,15971,383,1277]