Numbers k such that (9^k - 5^k)/4 is prime.

A128346

Numbers k such that (9^k - 5^k)/4 is prime.

Terms

    a(0) =3a(1) =11a(2) =17a(3) =173a(4) =839a(5) =971a(6) =40867a(7) =45821a(8) =147503

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