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A260893 as a simple table

na(n)
17
211
317
419
571
679
797
8179
9191
10197
11199
12719
13797
14911
15919
16971
17977
18991
19997
201117
211171
221777
231979
241997
251999
267177
277717
287919
299199
309719
319791
3211117
3311119
3411171
3511177
3611197
3711717
3811719
3911777
4011779
4111971
4217117
4317191
4417791
4517911

[7,11,17,19,71,79,97,179,191,197,199,719,797,911,
 919,971,977,991,997,1117,1171,1777,1979,1997,1999,
 7177,7717,7919,9199,9719,9791,11117,11119,11171,
 11177,11197,11717,11719,11777,11779,11971,17117,
 17191,17791,17911]