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A055781 as a simple table

na(n)
131
271
3131
4191
5311
6431
7971
81031
91091
101511
111571
121811
131931
142111
152411
162711
173371
183491
193671
204091
214211
224391
234871
245231
255471
265711
276011
286131
296311
306911
317331
327691
338111
348231
358291
368831
379371
3810091
3910211
4010331
4110391
4210631

[31,71,131,191,311,431,971,1031,1091,1511,1571,
 1811,1931,2111,2411,2711,3371,3491,3671,4091,4211,
 4391,4871,5231,5471,5711,6011,6131,6311,6911,7331,
 7691,8111,8231,8291,8831,9371,10091,10211,10331,
 10391,10631]