Numbers k such that 4*9^k + 1 is prime.

A056801

Numbers k such that 4*9^k + 1 is prime.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =7a(4) =627a(5) =1653a(6) =1761a(7) =4801a(8) =36349

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