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A268670 as a simple table

na(n)
11
23
31
47
51
63
75
815
95
103
1113
127
139
1411
151
1631
171
1811
1929
207
2125
2227
239
2415
2517
2619
275
2823
2913
303
3121
3263
3321
343
3561
3623
3757
3859
3913
4015
4149
4251
4317
4455
455
4619
4753
4831
4933
5035
511
5239
5329
5411
5537
5647
579
5827
5945
607
6141
6243
6325
64127
6525
6643
67125
687
69121
70123
7141
7247
73113
74115
759
76119
7745
7827
79117
8031
8197
8299
8333
84103
851

[1,3,1,7,1,3,5,15,5,3,13,7,9,11,1,31,1,11,29,7,25,
 27,9,15,17,19,5,23,13,3,21,63,21,3,61,23,57,59,13,
 15,49,51,17,55,5,19,53,31,33,35,1,39,29,11,37,47,
 9,27,45,7,41,43,25,127,25,43,125,7,121,123,41,47,
 113,115,9,119,45,27,117,31,97,99,33,103,1]