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A238895 as a simple table

na(n)
12
23
36
421
531
649
773
891
9115
10121
11169
12211
13301
14331
15361
16391
17421
18511
19631
20721
21781
22841
231051
241261
251471
261561
271681
281891
292101
302311
312521
322731
333151
343361
353571
363991
374201
384411
394621
405251
415461
426091
436511
446721
456931
467771
477981
488191
499031

[2,3,6,21,31,49,73,91,115,121,169,211,301,331,361,
 391,421,511,631,721,781,841,1051,1261,1471,1561,
 1681,1891,2101,2311,2521,2731,3151,3361,3571,3991,
 4201,4411,4621,5251,5461,6091,6511,6721,6931,7771,
 7981,8191,9031]