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A139921 as a simple table

na(n)
13
2107
3131
4179
5251
6347
7419
8443
9467
10491
11563
12659
13971
141091
151187
161283
171427
181499
191667
201811
211907
221979
232003
242027
252339
262531
272843
282939
292963
303251
313299
323371
333467
343539
353779
363851
373923
384091
394211
404523
414547
424787

[3,107,131,179,251,347,419,443,467,491,563,659,
 971,1091,1187,1283,1427,1499,1667,1811,1907,1979,
 2003,2027,2339,2531,2843,2939,2963,3251,3299,3371,
 3467,3539,3779,3851,3923,4091,4211,4523,4547,4787]