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A273285 as a simple table

na(n)
22
33
44
55
69
77
88
99
1025
1111
1227
1313
1425
1525
1616
1717
1827
1919
2027
2125
2225
2323
2481
2525
2649
2727
28125
2929
30125
3131
3232
3349
3449
3549
3681
3737
3849
3949
4081
4141
42125
4343
44125
45125
4649
4747
48243
4949
50125
51121
52125
5353
5481
55121
5681
57121
58121
5959
6081
6161
62121
63125
6464
65121
66125
6767
68125
69121
70125
7171

[2,3,4,5,9,7,8,9,25,11,27,13,25,25,16,17,27,19,27,
 25,25,23,81,25,49,27,125,29,125,31,32,49,49,49,81,
 37,49,49,81,41,125,43,125,125,49,47,243,49,125,
 121,125,53,81,121,81,121,121,59,81,61,121,125,64,
 121,125,67,125,121,125,71]