Numbers n such that determinant[{{n, phi(n), sigma(n)}, {n+1, phi(n+1), sigma(n+1)}, {n+2, phi(n+2), sigma(n+2)}}] is a nonnegative cube.
A067564
Numbers n such that determinant[{{n, phi(n), sigma(n)}, {n+1, phi(n+1), sigma(n+1)}, {n+2, phi(n+2), sigma(n+2)}}] is a nonnegative cube.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =217a(4) =12021
External references
- oeis: A067564