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A083520 as a simple table

na(n)
13
27
313
431
543
661
773
8157
9211
10241
11307
12337
13421
14463
15601
16757
17991
181123
191321
201483
211723
222521
232551
242731
252971
263307
273361
283541
293907
304423
314831
325113
335701
346007
356163
366481
376841
388011
398191
409241
419901
4210303
4310627
4411131
4512211
4612433

[3,7,13,31,43,61,73,157,211,241,307,337,421,463,
 601,757,991,1123,1321,1483,1723,2521,2551,2731,
 2971,3307,3361,3541,3907,4423,4831,5113,5701,6007,
 6163,6481,6841,8011,8191,9241,9901,10303,10627,
 11131,12211,12433]