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A091228 as a simple table

na(n)
02
12
22
33
47
57
67
77
811
911
1011
1111
1213
1313
1419
1519
1619
1719
1819
1919
2025
2125
2225
2325
2425
2525
2631
2731
2831
2931
3031
3131
3237
3337
3437
3537
3637
3737
3841
3941
4041
4141
4247
4347
4447
4547
4647
4747
4855
4955
5055
5155
5255
5355
5455
5555
5659
5759
5859
5959
6061
6161
6267
6367
6467
6567
6667
6767
6873
6973
7073

[2,2,2,3,7,7,7,7,11,11,11,11,13,13,19,19,19,19,19,
 19,25,25,25,25,25,25,31,31,31,31,31,31,37,37,37,
 37,37,37,41,41,41,41,47,47,47,47,47,47,55,55,55,
 55,55,55,55,55,59,59,59,59,61,61,67,67,67,67,67,
 67,73,73,73]