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A173815 as a simple table

na(n)
11
23
33
49
57
69
77
89
911
1019
1117
1215
139
1415
1513
1629
1723
1827
1933
2023
2129
2221
2331
2431
2535
2625
2727
2827
2941
3089
3157
3267
3351
3463
3549
3649
3749
3843
3939
4051
4139
4263
4347
4465
4545
4675
4795
4871
4967
5079
5159
5261
5359
5473
5561
5665
5777
5873
5975
6063
6195
6281
6387
6471
65103
66107
6785
6885
69101
7087
7171

[1,3,3,9,7,9,7,9,11,19,17,15,9,15,13,29,23,27,33,
 23,29,21,31,31,35,25,27,27,41,89,57,67,51,63,49,
 49,49,43,39,51,39,63,47,65,45,75,95,71,67,79,59,
 61,59,73,61,65,77,73,75,63,95,81,87,71,103,107,85,
 85,101,87,71]