Numbers k such that !k + phi(k) - 1 is prime.

A063685

Numbers k such that !k + phi(k) - 1 is prime.

Terms

    a(0) =2a(1) =3a(2) =4a(3) =5a(4) =11a(5) =20a(6) =85a(7) =212a(8) =4925

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