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A156899 as a simple table

na(n)
11
22
33
45
55
67
79
811
913
1013
1113
1217
1319
1419
1519
1623
1725
1829
1929
2031
2132
2232
2332
2437
2537
2637
2741
2841
2943
3043
3147
3249
3353
3453
3553
3653
3759
3861
3961
4064
4164
4267
4367
4467
4571
4673
4773
4873
4973
5079
5181
5283
5383
5483
5583
5689
5789
5889
5989
6089
6197
62101
63101
64103
65103
66103
67107
68109
69109

[1,2,3,5,5,7,9,11,13,13,13,17,19,19,19,23,25,29,
 29,31,32,32,32,37,37,37,41,41,43,43,47,49,53,53,
 53,53,59,61,61,64,64,67,67,67,71,73,73,73,73,79,
 81,83,83,83,83,89,89,89,89,89,97,101,101,103,103,
 103,107,109,109]