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A087578 as a simple table

na(n)
13
27
313
431
5127
6307
71093
81723
92801
103541
115113
128011
138191
1410303
1517293
1619531

[3,7,13,31,127,307,1093,1723,2801,3541,5113,8011,
 8191,10303,17293,19531]