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A056896 as a simple table

na(n)
12
22
33
45
55
67
77
817
913
1011
1111
1213
1313
1423
1519
1617
1717
1819
1919
2029
2137
2223
2323
2473
2529
26107
2731
2829
2929
3031
3131
3241
3337
3443
3571
3637
3737
3847
3943
4041
4141
4243
4343
4453
4561
4647
4747
4873
4953
5059
5167
5253
5353
5479
5559
56137
5761
5859
5959
6061
6161
6271
6367
6473
65101
6667
6767
68149
6973
7071

[2,2,3,5,5,7,7,17,13,11,11,13,13,23,19,17,17,19,
 19,29,37,23,23,73,29,107,31,29,29,31,31,41,37,43,
 71,37,37,47,43,41,41,43,43,53,61,47,47,73,53,59,
 67,53,53,79,59,137,61,59,59,61,61,71,67,73,101,67,
 67,149,73,71]