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A099936 as a simple table

na(n)
12
23
35
417
5257
612289
714155777
8169869313
94076863489
1032318253138475745281
1112806790724213976503626296721408001
12307362977381135436087031121313792001

[2,3,5,17,257,12289,14155777,169869313,4076863489,
 32318253138475745281,
 12806790724213976503626296721408001,
 307362977381135436087031121313792001]