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A318661 as a simple table

na(n)
11
21
33
41
55
63
77
83
919
105
1111
123
1313
147
1515
165
1717
1819
1919
205
2121
2211
2323
249
2559
2613
2795
287
2929
3015
3131
329
3333
3417
3535
3619
3737
3819
3939
4015
4141
4221
4343
4411
4595
4623
4747
4815
49123
5059
5151
5213
5353
5495
5555
5621
5757
5829
5959
6015
6161
6231
63133
6467
6565
6633
6767
6817
6969
7035
7171
7257
7373
7437
75177
7619
7777
7839
7979
8025
812019
8241
8383
8421
8585
8643
8787
8833
8989

[1,1,3,1,5,3,7,3,19,5,11,3,13,7,15,5,17,19,19,5,
 21,11,23,9,59,13,95,7,29,15,31,9,33,17,35,19,37,
 19,39,15,41,21,43,11,95,23,47,15,123,59,51,13,53,
 95,55,21,57,29,59,15,61,31,133,67,65,33,67,17,69,
 35,71,57,73,37,177,19,77,39,79,25,2019,41,83,21,
 85,43,87,33,89]