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A171487 as a simple table

na(n)
11
21
31
49
59
61
715
815
91
1021
1121
1225
13675
1427
151
1633
171155
1835
1939
2039
211
2245
2345
2449
252499
2651
2755
283135
2957
301
3163
324095
3365
3469
3569
361
3775
385775
3977
4081
4181
4285
437395
4487
4591
468463
478835
4895
4999
5099
511
52105
53105
541
55111
56111
57115
5813455
5913923
6014399
6114883
6215375

[1,1,1,9,9,1,15,15,1,21,21,25,675,27,1,33,1155,35,
 39,39,1,45,45,49,2499,51,55,3135,57,1,63,4095,65,
 69,69,1,75,5775,77,81,81,85,7395,87,91,8463,8835,
 95,99,99,1,105,105,1,111,111,115,13455,13923,
 14399,14883,15375]