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A061427 as a simple table

na(n)
13
219
333
491
5139
6193
7319
8333
9391
10913
11931
121199
131339
141393
151919
161933
171991
183139
193193
203319
213333
223391
233913
243931
259119
269133
279191
289313
299331
309911
3111399
3211939
3311993
3413199
3513339
3613393
3713919
3813933
3913991
4019139
4119193

[3,19,33,91,139,193,319,333,391,913,931,1199,1339,
 1393,1919,1933,1991,3139,3193,3319,3333,3391,3913,
 3931,9119,9133,9191,9313,9331,9911,11399,11939,
 11993,13199,13339,13393,13919,13933,13991,19139,
 19193]