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A068148 as a simple table

na(n)
12
23
35
47
511
623
743
867
989
10101
11109
12211
13223
14233
15433
16443
17677
18787
19877
20887
211009
221109
231123
241223
252111
262221
272333
283221
293323
303343
313433
324567
335443
347789
357877
368887
378999
389001
399011
409887
419901
4210009
4310099
4410111
4510909
4610987
4712101
4812109

[2,3,5,7,11,23,43,67,89,101,109,211,223,233,433,
 443,677,787,877,887,1009,1109,1123,1223,2111,2221,
 2333,3221,3323,3343,3433,4567,5443,7789,7877,8887,
 8999,9001,9011,9887,9901,10009,10099,10111,10909,
 10987,12101,12109]