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A247843 as a simple table

na(n)
12
23
37
48
517
633
738
853
957
1058
11157
12187
13237
14313
15333
16557
17558
18672
19688
20738
21787
22788
23812
24813
25853
261557
272087
282107
292112
303112
313113
323157
333333
343357
353358
364453
374553
385598
395857
406672
416688
427017
437287
447772
457888
467908
478087
488337
4915787
5017157
5118557
5222112
5332358

[2,3,7,8,17,33,38,53,57,58,157,187,237,313,333,
 557,558,672,688,738,787,788,812,813,853,1557,2087,
 2107,2112,3112,3113,3157,3333,3357,3358,4453,4553,
 5598,5857,6672,6688,7017,7287,7772,7888,7908,8087,
 8337,15787,17157,18557,22112,32358]