Numbers k such that (3^k + 7^k)/10 is prime.

A128067

Numbers k such that (3^k + 7^k)/10 is prime.

Terms

    a(0) =3a(1) =13a(2) =31a(3) =313a(4) =3709a(5) =7933a(6) =14797a(7) =30689a(8) =38333

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