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A030680 as a simple table

na(n)
123
231
353
471
5113
61013
71319
81511
91811
101913
113137
123533
133733
143833
1572701
167573
177873
1879757
199199
209293
211030111
22105019
23106013
24113111
25114113
26124213
27127217
28128213
29133319
30138311
31139313
32143413
33147419
341545101
351555111
36160619
37163613
38165611

[23,31,53,71,113,1013,1319,1511,1811,1913,3137,
 3533,3733,3833,72701,7573,7873,79757,9199,9293,
 1030111,105019,106013,113111,114113,124213,127217,
 128213,133319,138311,139313,143413,147419,1545101,
 1555111,160619,163613,165611]