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A106908 as a simple table

na(n)
15
211
331
489
5179
6181
7191
8331
9401
10419
11421
12449
13521
14599
15619
16641
17709
18719
19829
20859
21911
22971
23991
241021
251039
261109
271259
281291
291301
301489
311511
321549
331621
341709
351831
361871
371879
382011
392039
402099
412161
422179
432281
442311
452381

[5,11,31,89,179,181,191,331,401,419,421,449,521,
 599,619,641,709,719,829,859,911,971,991,1021,1039,
 1109,1259,1291,1301,1489,1511,1549,1621,1709,1831,
 1871,1879,2011,2039,2099,2161,2179,2281,2311,2381]