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A273291 as a simple table

na(n)
22
33
44
55
69
77
88
99
1025
1111
128
1313
1425
1525
1616
1717
1827
1919
208
2125
2249
2323
2416
2525
26121
2727
288
2929
3027
3131
3232
3349
34121
3549
3681
3737
38121
39121
4016
4141
4227
4343
448
4527
46169
4747
4832
4949
50125
51121
528
5353
5481
55121
5616
57121
58289
5959
6081
6161
62289
6327
6464
65121
6627
6767
688
69169
70125

[2,3,4,5,9,7,8,9,25,11,8,13,25,25,16,17,27,19,8,
 25,49,23,16,25,121,27,8,29,27,31,32,49,121,49,81,
 37,121,121,16,41,27,43,8,27,169,47,32,49,125,121,
 8,53,81,121,16,121,289,59,81,61,289,27,64,121,27,
 67,8,169,125]