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A309507 as a simple table

na(n)
10
21
31
41
53
63
71
82
95
103
113
123
133
147
153
161
175
185
193
207
217
223
233
245
255
267
277
283
297
307
311
323
337
347
3511
365
373
387
397
403
417
427
433
4411
4511
463
473
485
498
5011
517
523
537
5415
557
567
577
583
597
607
613
6211
635
643
6515
667
673
687
6915
707
715
725
733
7411
7511
767
7715
787
793
809
819
823
837

[0,1,1,1,3,3,1,2,5,3,3,3,3,7,3,1,5,5,3,7,7,3,3,5,
 5,7,7,3,7,7,1,3,7,7,11,5,3,7,7,3,7,7,3,11,11,3,3,
 5,8,11,7,3,7,15,7,7,7,3,7,7,3,11,5,3,15,7,3,7,15,
 7,5,5,3,11,11,7,15,7,3,9,9,3,7]