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A263581 as a simple table

na(n)
12
23
34
45
58
69
717
825
949
1064
11121
12169
13257
14289
15729
16841
171681
181849
193481
205329
2111881
2212769
2316129
2418769
2524649
2632041
2732761
2838809
2939601
3044521
3159049
3263001
3365537
3469169
3576729
3685849
3796721
38124609
39134689
40143641
41167281
42175561
43187489

[2,3,4,5,8,9,17,25,49,64,121,169,257,289,729,841,
 1681,1849,3481,5329,11881,12769,16129,18769,24649,
 32041,32761,38809,39601,44521,59049,63001,65537,
 69169,76729,85849,96721,124609,134689,143641,
 167281,175561,187489]