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A056730 as a simple table

na(n)
1101
2131
3151
4181
5191
6313
7353
8373
9383
10727
11757
12787
13797
14919
15929
1611311
1711411
1813331
1915551
2016661
2118181
2219991
2332323
2433533
2535353
2672227
2772727
2874747
2975557
3076667
3177377
3277477
3377977
3478787
3578887
3679997
3794949
3895959

[101,131,151,181,191,313,353,373,383,727,757,787,
 797,919,929,11311,11411,13331,15551,16661,18181,
 19991,32323,33533,35353,72227,72727,74747,75557,
 76667,77377,77477,77977,78787,78887,79997,94949,
 95959]