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.

2, 20, 24, 360, 816, 1056, 12240, 15840, 29120, 181632, 287300, 2724480, 93358848, 1400382720

Offset: 1

Author

Yasutoshi Kohmoto, Feb 02 2009

Keywords

• nonn
• more

Examples

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

Crossrefs

Cf. A034448, A144673, A144672.