login

A139854 as a simple table

na(n)
13
243
367
4163
5283
6307
7523
8547
9643
10787
11883
12907
131123
141483
151627
161723
171747
181867
191987
202083
212203
222347
232467
242683
252707
262803
273067
283163
293187
303307
313547
323643
333907
344003
354027
364243
374363
384483
394507
404603
414723
424987
435107

[3,43,67,163,283,307,523,547,643,787,883,907,1123,
 1483,1627,1723,1747,1867,1987,2083,2203,2347,2467,
 2683,2707,2803,3067,3163,3187,3307,3547,3643,3907,
 4003,4027,4243,4363,4483,4507,4603,4723,4987,5107]