Numbers k such that (17^k + 4^k)/21 is prime.

A228558

Numbers k such that (17^k + 4^k)/21 is prime.

Terms

    a(0) =13a(1) =61a(2) =67a(3) =107a(4) =383a(5) =647a(6) =3571a(7) =37967

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