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A031161 as a simple table

na(n)
11
23
37
49
533
699
7111
8141
9151
10171
11303
12393
13535
14717
15727
16777
17787
18979
191441
201771
213003
223223
233663
245335
257447
269009
279339
289999
2910501
3011011
3111811
3211911
3312121
3412321
3512621
3613531
3713831
3814041
3914541
4014841
4117671
4218181

[1,3,7,9,33,99,111,141,151,171,303,393,535,717,
 727,777,787,979,1441,1771,3003,3223,3663,5335,
 7447,9009,9339,9999,10501,11011,11811,11911,12121,
 12321,12621,13531,13831,14041,14541,14841,17671,
 18181]