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A177879 as a simple table

na(n)
17
297
331
4708158977
5127
622783
7113210499946729046527
812289
91049179854847
1022427452848394140276947044397991663611794141183
118191
1229687809

[7,97,31,708158977,127,22783,
 113210499946729046527,12289,1049179854847,
 22427452848394140276947044397991663611794141183,
 8191,29687809]