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A139083 as a simple table

na(n)
13
25
37
49
57
69
715
817
911
1013
1114
1216
1315
145
1519
1633
1719
1821
1923
207
215
2225
2326
2428
2527
2629
2731
2833
2931
3033
3163
3235
335
347
359
3641
3739
385
398
4046
4143
4245
4347
449
457
4649
4750
4852
4951
505
517
5257
5355
547
5512
5610
575
5861
5962
6064
6163
629
6371
6469
657
6669
6771
687
695
7073
7179
7281
7375
745
757
7611
779
7881

[3,5,7,9,7,9,15,17,11,13,14,16,15,5,19,33,19,21,
 23,7,5,25,26,28,27,29,31,33,31,33,63,35,5,7,9,41,
 39,5,8,46,43,45,47,9,7,49,50,52,51,5,7,57,55,7,12,
 10,5,61,62,64,63,9,71,69,7,69,71,7,5,73,79,81,75,
 5,7,11,9,81]