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A131319 as a simple table

na(n)
11
22
33
45
55
69
711
813
913
1017
1119
1213
1319
1425
1527
1626
1725
1833
1935
2032
2133
2234
2335
2445
2541
2649
2751
2853
2943
3034
3154
3251
3356
3456
3567
3661
3755
3873
3955
4067
4169
4281
4365
4485
4567
4682
4791
4893
4989
5097
5199
5288
5389
54105
55107
5689
5797
5897
5989
6098
61111
62121
63109
64118
65105
66129
67112

[1,2,3,5,5,9,11,13,13,17,19,13,19,25,27,26,25,33,
 35,32,33,34,35,45,41,49,51,53,43,34,54,51,56,56,
 67,61,55,73,55,67,69,81,65,85,67,82,91,93,89,97,
 99,88,89,105,107,89,97,97,89,98,111,121,109,118,
 105,129,112]