Numbers k such that ud(k)*phi(k) = sigma(k), ud(k) = A034444.

A063903

Numbers k such that ud(k)*phi(k) = sigma(k), ud(k) = A034444.

Terms

    a(0) =1a(1) =3a(2) =14a(3) =42a(4) =248a(5) =594a(6) =744a(7) =4064a(8) =7668a(9) =12192a(10) =16775168a(11) =50325504a(12) =4294934528a(13) =12884803584a(14) =68719345664a(15) =206158036992

External references