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A239691 as a simple table

na(n)
12
23
31
43
53
65
75
87
97
105
113
125
135
147
157
165
177
185
197
207
219
227
237
249
259
265
277
287
299
309
313
323
335
347
359
363
375
387
397
409
417
425
437
449
459
4611
477
4811
497
509
519
5211
539
543
555
567
579
587
595
605
617
629
637
647
659
669
677
689
6911
7013
719
7211
7311
7413
757
767
779
789
795
809
8111
829
837
849

[2,3,1,3,3,5,5,7,7,5,3,5,5,7,7,5,7,5,7,7,9,7,7,9,
 9,5,7,7,9,9,3,3,5,7,9,3,5,7,7,9,7,5,7,9,9,11,7,11,
 7,9,9,11,9,3,5,7,9,7,5,5,7,9,7,7,9,9,7,9,11,13,9,
 11,11,13,7,7,9,9,5,9,11,9,7,9]