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A068669 as a simple table

na(n)
11
22
33
45
57
611
713
817
923
1031
1137
1253
1371
1473
15113
16131
17137
18173
19311
20313
21317
22373
231373
243137

[1,2,3,5,7,11,13,17,23,31,37,53,71,73,113,131,137,
 173,311,313,317,373,1373,3137]