ChallangeProblem.

Characterize all the the positive integers such that . ( is Euler's Phi-Function.)

Moderator edit:Approved challenge question.

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- Nov 23rd 2010, 12:24 PMmeleseCharacterize integers, divisibility.
**ChallangeProblem.**

Characterize all the the positive integers such that . ( is Euler's Phi-Function.)

**Moderator edit:**Approved challenge question. - Nov 23rd 2010, 02:57 PMtonio