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A247479 as a simple table

na(n)
13
23
35
47
53
63
75
83
915
1013
119
123
135
147
155
1621
179
183
1911
207
2111
2225
2345
2445
255
267
2715
2813
2923
303
3135
3243
339
3475
3559
363
3715
3815
395
4027
413
429
439
4415
4535
4619
4727
4815
4923
507
5117
527
5351
5449
555
5627
5729
5899
5927
6031
6153
62105
639
6425
659
663
679
6831
6923

[3,3,5,7,3,3,5,3,15,13,9,3,5,7,5,21,9,3,11,7,11,
 25,45,45,5,7,15,13,23,3,35,43,9,75,59,3,15,15,5,
 27,3,9,9,15,35,19,27,15,23,7,17,7,51,49,5,27,29,
 99,27,31,53,105,9,25,9,3,9,31,23]