A116003 n*phi(n)*phi(phi(n)) is a fourth power.

1, 32, 512, 3888, 8192, 25000, 62208, 131072, 314928, 400000, 759375, 995328, 2097152, 2839714, 3037500

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Example

3888*phi(3888)*phi(phi(3888))=216^4.

Crossrefs

Cf. A055744, A116002.

Sequence in context: A297091 A371453 A271577 * A035711 A035477 A109384

Adjacent sequences: A116000 A116001 A116002 * A116004 A116005 A116006

Keyword

nonn

Author

Giovanni Resta, Feb 13 2006

Status

approved