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A207873 as a simple table

na(n)
11
21
31
45
51
69
75
81
917
109
115
1221
131
1433
1517
169
1741
185
1937
2021
211
2265
2333
2417
2581
269
2773
2841
295
3069
3137
3221
3385
341
35129
3665
3733
38161
3917
40145
4181
429
43137
4473
4541
46169
475
48133
4969
5037
51165
5221
53149
5485
551
56257
57129
5865
59321
6033
61289
62161
6317
64273
65145
6681
67337

[1,1,1,5,1,9,5,1,17,9,5,21,1,33,17,9,41,5,37,21,1,
 65,33,17,81,9,73,41,5,69,37,21,85,1,129,65,33,161,
 17,145,81,9,137,73,41,169,5,133,69,37,165,21,149,
 85,1,257,129,65,321,33,289,161,17,273,145,81,337]