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A144674 Numbers x,y,z such that UnitarySigma(x) = UnitarySigma(y) = UnitarySigma(z) = 3*(x*y*z)^(1/2)/(- x^(1/2) + 8*y^(1/2) - 5*z^(1/2)), z<=y<=x; sequence gives z. 4

%I #5 Jan 24 2019 04:51:14

%S 2,20,24,360,816,1056,12240,15840,29120,181632,287300,2724480,

%T 93358848,1400382720

%N Numbers x,y,z such that UnitarySigma(x) = UnitarySigma(y) = UnitarySigma(z) = 3*(x*y*z)^(1/2)/(- x^(1/2) + 8*y^(1/2) - 5*z^(1/2)), z<=y<=x; sequence gives z.

%e Factorization of a(11) : 17*5^2*2^2*13^2.

%Y Cf. A034448, A144673, A144672.

%K nonn,more

%O 1,1

%A _Yasutoshi Kohmoto_, Feb 02 2009

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Last modified June 19 10:38 EDT 2024. Contains 373501 sequences. (Running on oeis4.)