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A186307 as a simple table

na(n)
12
23
35
47
511
613
717
831
961
1073
11181
12241
13421
14757
151009
161321
171801
182161

[2,3,5,7,11,13,17,31,61,73,181,241,421,757,1009,
 1321,1801,2161]