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A317587 as a simple table

na(n)
23
35
45
56
67
711
811
911
1011
1113
1213
1316
1417
1517
1617
1719
1819
1923
2023
2123
2223
2329
2429
2529
2629
2729
2829
2931
3031
3137
3237
3337
3436
3537
3637
3740
3841
3941
4041
4143
4243
4347
4447
4547
4647
4753
4853
4953
5053
5153
5253
5359
5459
5559
5659
5759
5859
5961
6061
6167
6267
6367
6467
6567
6667
6771
6871
6971
7071

[3,5,5,6,7,11,11,11,11,13,13,16,17,17,17,19,19,23,
 23,23,23,29,29,29,29,29,29,31,31,37,37,37,36,37,
 37,40,41,41,41,43,43,47,47,47,47,53,53,53,53,53,
 53,59,59,59,59,59,59,61,61,67,67,67,67,67,67,71,
 71,71,71]