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A076197 as a simple table

na(n)
15
27
321
433
5153
6167
7171
8391
9789
101323
112645
128655
1310153
1439967
1545369
1647599

[5,7,21,33,153,167,171,391,789,1323,2645,8655,
 10153,39967,45369,47599]