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

1,1

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A034448, A144673, A144672.

Sequence in context: A202170 A136908 A196748 * A144673 A144672 A145681

Adjacent sequences: A144671 A144672 A144673 * A144675 A144676 A144677

Keyword

nonn,more

Author

Yasutoshi Kohmoto, Feb 02 2009

Status

approved