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A240831 as a simple table

na(n)
21
31
41
51
61
71
81
91
101
111
121
131
141
157
161
171
181
191
201
217
221
237
241
251
261
277
281
297
301
317
321
337
341
357
361
377
381
397
407
417
421
437
441
457
467
477
487
497
501
517
527
537
547
557
567
577
587
597
607
617
627
637
6413
657
667
677
687
697
7013
717
7213
737
747
757
7613
777
7813
797
8013
817
8213
837
8413
857
8613
877
8819
897
9013
917
9213
937
9419
957
9619
977
9813
997
10019

[1,1,1,1,1,1,1,1,1,1,1,1,1,7,1,1,1,1,1,7,1,7,1,1,
 1,7,1,7,1,7,1,7,1,7,1,7,1,7,7,7,1,7,1,7,7,7,7,7,1,
 7,7,7,7,7,7,7,7,7,7,7,7,7,13,7,7,7,7,7,13,7,13,7,
 7,7,13,7,13,7,13,7,13,7,13,7,13,7,19,7,13,7,13,7,
 19,7,19,7,13,7,19]