Smallest k such that k*2^n +1 is an n-th power.

A193747

Smallest k such that k*2^n +1 is an n-th power.

Terms

    a(0) =1a(1) =2a(2) =91a(3) =5a(4) =1222981a(5) =13867245a(7) =3331605615

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