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A139931 as a simple table

na(n)
161
279
3109
4151
5271
6349
7439
8541
9919
101069
111231
121381
131399
141429
151471
161669
171759
181789
191861
201999
212221
222239
232389
242551
252719
262749
272791
283079
293109
303181
313229
323319
333511
343541
353559
363709
374021
384111
394231
404549
414639
424759

[61,79,109,151,271,349,439,541,919,1069,1231,1381,
 1399,1429,1471,1669,1759,1789,1861,1999,2221,2239,
 2389,2551,2719,2749,2791,3079,3109,3181,3229,3319,
 3511,3541,3559,3709,4021,4111,4231,4549,4639,4759]