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A131768 as a simple table

na(n)
01
13
21
35
45
51
67
711
87
91
109
1119
1219
139
141
1511
1629
1739
1829
1911
201
2113
2241
2369
2469
2541
2613
271
2815
2955
30111
31139
32111
3355
3415
351
3617
3771
38167
39251
40251
41167
4271
4317
441
4519
4689
47239
48419
49503
50419
51239
5289
5319
541

[1,3,1,5,5,1,7,11,7,1,9,19,19,9,1,11,29,39,29,11,
 1,13,41,69,69,41,13,1,15,55,111,139,111,55,15,1,
 17,71,167,251,251,167,71,17,1,19,89,239,419,503,
 419,239,89,19,1]