Numbers k such that (20^k - 1)/19 is prime.

A127995

Numbers k such that (20^k - 1)/19 is prime.

Terms

    a(0) =3a(1) =11a(2) =17a(3) =1487a(4) =31013a(5) =48859a(6) =61403a(7) =472709a(8) =984349

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