Numbers n such that (21^n+1)/22 is a prime.

A057187

Numbers n such that (21^n+1)/22 is a prime.

Terms

    a(0) =3a(1) =5a(2) =7a(3) =13a(4) =37a(5) =347a(6) =17597a(7) =59183a(8) =80761a(9) =210599a(10) =394579

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