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A089721 as a simple table

na(n)
131
241
361
4101
5131
6181
7191
8241
9251
10271
11311
12331
13401
14461
15521
16541
17601
18661
19691
20751
21761
22811
23821
24881
25941
26971
271021
281031
291091
301151
311171
321181
331231
341291
351301
361321
371361
381381
391451
401511
411531
421571
431601
441721
451741
461801
471811

[31,41,61,101,131,181,191,241,251,271,311,331,401,
 461,521,541,601,661,691,751,761,811,821,881,941,
 971,1021,1031,1091,1151,1171,1181,1231,1291,1301,
 1321,1361,1381,1451,1511,1531,1571,1601,1721,1741,
 1801,1811]