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A268640 as a simple table

na(n)
15
211
317
423
547
653
771
8107
9191
10383
11431
12647
13863
14971
151151
162591
174373
186143
196911
208747
2113121
2215551
2323327
2427647
2562207
2673727
27139967
28165887
29294911
30314927
31442367
32472391
33497663
34786431
35995327
361062881
372519423
3810616831
3917915903
4018874367

[5,11,17,23,47,53,71,107,191,383,431,647,863,971,
 1151,2591,4373,6143,6911,8747,13121,15551,23327,
 27647,62207,73727,139967,165887,294911,314927,
 442367,472391,497663,786431,995327,1062881,
 2519423,10616831,17915903,18874367]