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A003585 as a simple table

na(n)
13
27
321
431
533
643
767
879
987
10133
11217
12219
13223
14253
15307
16391
17679
182719

[3,7,21,31,33,43,67,79,87,133,217,219,223,253,307,
 391,679,2719]