Numbers n with the property that there are integers k, h such that sigma(n) = k^tau(n) = tau(n)^h.

A225362

Numbers n with the property that there are integers k, h such that sigma(n) = k^tau(n) = tau(n)^h.

Terms

    a(0) =1a(1) =3a(2) =217a(3) =3937a(4) =57337a(5) =917497a(6) =1040257a(7) =11010027a(8) =12189603a(9) =16252897a(10) =16646017a(11) =3612185689a(12) =4294434817a(13) =66571993057a(14) =68718821377

External references