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A248713 as a simple table

na(n)
11
22
33
44
55
623
77
8731173
99
1025
1111
1231397
1313
14313
151129
1616
1717
1829
1919
2059
2137
22211
2323
24731173
2525
263251
27313
2847
2929
30547
3131
32313289
33311
3431397
351129
3649
3737
38373
39313
40961
4141
42379
4343
443137
4559
46223
4747
48479
4949
5071443
51317
5231123
5353
54239
55773

[1,2,3,4,5,23,7,731173,9,25,11,31397,13,313,1129,
 16,17,29,19,59,37,211,23,731173,25,3251,313,47,29,
 547,31,313289,311,31397,1129,49,37,373,313,961,41,
 379,43,3137,59,223,47,479,49,71443,317,31123,53,
 239,773]