Numbers n such that (16^n + 5^n)/21 is prime.

A225397

Numbers n such that (16^n + 5^n)/21 is prime.

Terms

    a(0) =31a(1) =109a(2) =373a(3) =409a(4) =619a(5) =823a(6) =1531a(7) =6637a(8) =70687

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