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A247666 as a simple table

na(n)
01
17
27
325
47
549
625
7103
87
949
1049
11175
1225
13175
14103
15409
167
1749
1849
19175
2049
21343
22175
23721
2425
25175
26175
27625
28103
29721
30409
311639
327
3349
3449
35175
3649
37343
38175
39721
4049
41343
42343
431225
44175
451225
46721
472863
4825
49175
50175
51625

[1,7,7,25,7,49,25,103,7,49,49,175,25,175,103,409,
 7,49,49,175,49,343,175,721,25,175,175,625,103,721,
 409,1639,7,49,49,175,49,343,175,721,49,343,343,
 1225,175,1225,721,2863,25,175,175,625]