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

A128026

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

Terms

    a(0) =2a(1) =3a(2) =5a(3) =37a(4) =599a(5) =38393a(6) =51431a(7) =118681a(8) =376417

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