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A103991 as a simple table

na(n)
13
25
321
49
511
639
715
817
957
1021
1123
1275
1327
1429
1593
1633
1735
18111
1939
2041
21129
2245
2347
24147
2551
2653
27165
2857
2959
30183
3163
3265
33201
3469
3571
36219
3775
3877
39237
4081
4183
42255
4387
4489
45273
4693
4795
48291
4999
50101
51309
52105
53107
54327
55111
56113
57345
58117
59119
60363

[3,5,21,9,11,39,15,17,57,21,23,75,27,29,93,33,35,
 111,39,41,129,45,47,147,51,53,165,57,59,183,63,65,
 201,69,71,219,75,77,237,81,83,255,87,89,273,93,95,
 291,99,101,309,105,107,327,111,113,345,117,119,
 363]