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A239619 as a simple table

na(n)
12
21
33
43
53
63
75
83
95
103
113
123
135
145
155
167
175
185
195
207
215
227
233
245
255
265
275
287
293
305
315
327
335
345
357
367
377
383
395
405
417
425
435
445
457
465
477
487
497
507
519
529
539
545
555
565
577
583
595
605
615
627
635
647
657
667
675
685
697
707
715
727
737
747
755
767
777
787
799
805
817
827
839
845
857
867
879

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