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A260828 as a simple table

na(n)
15
27
311
417
571
6151
7157
8557
9571
10577
11751
12757
131117
141151
151171
161511
171571
181777
195171
205557
215711
225717
237151
247177
257517
267577
277717
287757
2911117
3011171
3111177
3211551
3311717
3411777
3515511
3615551
3717117
3817551
3951151
4051157
4151511
4251517
4351551
4451577

[5,7,11,17,71,151,157,557,571,577,751,757,1117,
 1151,1171,1511,1571,1777,5171,5557,5711,5717,7151,
 7177,7517,7577,7717,7757,11117,11171,11177,11551,
 11717,11777,15511,15551,17117,17551,51151,51157,
 51511,51517,51551,51577]