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A048691 as a simple table

na(n)
11
23
33
45
53
69
73
87
95
109
113
1215
133
149
159
169
173
1815
193
2015
219
229
233
2421
255
269
277
2815
293
3027
313
3211
339
349
359
3625
373
389
399
4021
413
4227
433
4415
4515
469
473
4827
495
5015
519
5215
533
5421
559
5621
579
589
593
6045
613
629
6315
6413
659
6627
673
6815
699
7027
713
7235
733
749
7515
7615
779
7827
793
8027

[1,3,3,5,3,9,3,7,5,9,3,15,3,9,9,9,3,15,3,15,9,9,3,
 21,5,9,7,15,3,27,3,11,9,9,9,25,3,9,9,21,3,27,3,15,
 15,9,3,27,5,15,9,15,3,21,9,21,9,9,3,45,3,9,15,13,
 9,27,3,15,9,27,3,35,3,9,15,15,9,27,3,27]