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A272644 as a simple table

na(n)
21
31
41
51
65
71
81
913
1013
111
121
1329
1473
1529
161
171
1861
19301
20301
2161
221
231
24125
251081
262069
271081
28125
291
301
31253
323613
3311581
3411581
353613
36253
371
381
39509
4011593
4157749
4295401
4357749
4411593
45509
461
471
481021
4936301
50268381
51673261
52673261
53268381
5436301
551021
561

[1,1,1,1,5,1,1,13,13,1,1,29,73,29,1,1,61,301,301,
 61,1,1,125,1081,2069,1081,125,1,1,253,3613,11581,
 11581,3613,253,1,1,509,11593,57749,95401,57749,
 11593,509,1,1,1021,36301,268381,673261,673261,
 268381,36301,1021,1]