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A139991 as a simple table

na(n)
171
2191
3239
4359
5431
6599
7911
81031
91439
101871
112039
122111
132591
142711
152879
163119
173719
184271
194391
204799
215231
225279
235399
245471
255639
266311
276791
286911
296959
307079
317151
327919
338831
348999
359311
369431
379479
389839
3910151
4010271
4111159

[71,191,239,359,431,599,911,1031,1439,1871,2039,
 2111,2591,2711,2879,3119,3719,4271,4391,4799,5231,
 5279,5399,5471,5639,6311,6791,6911,6959,7079,7151,
 7919,8831,8999,9311,9431,9479,9839,10151,10271,
 11159]