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A068164 as a simple table

na(n)
111
22
33
441
55
661
77
883
919
10101
1111
12127
1313
14149
15151
16163
1717
18181
1919
201201
21211
22223
2323
24241
25251
26263
27127
28281
2929
30307
3131
321321
33233
34347
35353
36367
3737
38383
39139
40401
4141
42421
4343
44443
45457
46461
4747
48487
49149
50503
51151
52521
5353
54541
55557
56563
57157

[11,2,3,41,5,61,7,83,19,101,11,127,13,149,151,163,
 17,181,19,1201,211,223,23,241,251,263,127,281,29,
 307,31,1321,233,347,353,367,37,383,139,401,41,421,
 43,443,457,461,47,487,149,503,151,521,53,541,557,
 563,157]