A114074 phi(n) + n is a cube.

6, 44, 48, 162, 168, 344, 352, 384, 668, 1296, 1344, 1832, 2561, 2732, 2752, 2816, 2949, 3072, 4374, 4392, 4536, 4680, 5344, 5901, 9625, 10368, 10752, 13160, 14636, 14656, 21848, 21856, 22016, 22528, 23875, 24576, 26204, 33335, 34992, 35136

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..250

Example

phi(44) + 44 = 64 = 4^3.

Mathematica

Select[Range[40000], IntegerQ[Surd[EulerPhi[#]+#, 3]]&] (* Harvey P. Dale, Jan 07 2020 *)

Prog

(PARI) isok(n) = ispower(eulerphi(n) + n, 3); \\ Michel Marcus, Jan 22 2014

Crossrefs

Sequence in context: A090339 A225159 A078810 * A075337 A000561 A292057

Adjacent sequences: A114071 A114072 A114073 * A114075 A114076 A114077

Keyword

nonn

Author

Giovanni Resta, Feb 13 2006

Status

approved