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A033873 as a simple table

na(n)
01
11
21
39
47
53
63
719
87
97
1019
113
1239
1337
1431
1537
1661
173
183
1951
2039
21117
229
23117
247
2513
2667
27103
28331
29319
3057
3133
3249
3361
34193
3569
3667
3743
38133
393
40121
41109
4263
4357
4431
459
46121
4733
48193
499
50151
51121
52327
53171
5431
5521
563
57279
58159
5919
607
6193
62447
63121
6457
6549
6649
6749
6899
699

[1,1,1,9,7,3,3,19,7,7,19,3,39,37,31,37,61,3,3,51,
 39,117,9,117,7,13,67,103,331,319,57,33,49,61,193,
 69,67,43,133,3,121,109,63,57,31,9,121,33,193,9,
 151,121,327,171,31,21,3,279,159,19,7,93,447,121,
 57,49,49,49,99,9]