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A105768 as a simple table

na(n)
13
27
331
4127
5983
6122401
715231991
830341581
960439343
10239818559
11235883775871
12935968272887
13462162688688737
143592979567873032703
15439785318101603999198591
16432569613524779275706080077

[3,7,31,127,983,122401,15231991,30341581,60439343,
 239818559,235883775871,935968272887,
 462162688688737,3592979567873032703,
 439785318101603999198591,
 432569613524779275706080077]