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2014-11-08T16:46:14+02:00
F=11^11+22^22+33^33+44^44
U=(11^11+22^22+33^33+44^44)
U(11^11)=1
U(22^22)=U(2^2)=4
U(33^33)=U(3^3)=U(27)=7
U(44^44)=U(4^4)=6
U(11^11+22^22+33^33+44^44)=1+4+7+6=18
U(11^11+22^22+33^33+44^44)=8

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