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A118496 as a simple table

na(n)
12
23
35
47
511
631
771
8101
9701
10941
11971
12991
139001
149011
159221
169521
179941
1870001
1976001
2097001
2199401
2299431
2399571
2499989
25940001
26973001
27987101
28993401
29997811
30999431

[2,3,5,7,11,31,71,101,701,941,971,991,9001,9011,
 9221,9521,9941,70001,76001,97001,99401,99431,
 99571,99989,940001,973001,987101,993401,997811,
 999431]