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A156768 as a simple table

na(n)
12
25
311
419
537
611
713
817
917
1029
1111
1213
1317
1417
1519
1623
1723
1823
1923
2029
2123
2229
2337
2431
2541
2641
2729
2829
2929
3031
3131
3237
3337
3437
3541
3641
3741
3841
3943
4043
4141
4243
4347
4447
4553
4653
4753
4853
4959
5059
5153
5259
5359
5459
5559
5667
5767
5871
5967
6071
6161
6267
6367
6467
6571
6671
6773
6879
6989
7089

[2,5,11,19,37,11,13,17,17,29,11,13,17,17,19,23,23,
 23,23,29,23,29,37,31,41,41,29,29,29,31,31,37,37,
 37,41,41,41,41,43,43,41,43,47,47,53,53,53,53,59,
 59,53,59,59,59,59,67,67,71,67,71,61,67,67,67,71,
 71,73,79,89,89]