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A144673 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 y. 4
2, 20, 24, 360, 816, 1056, 12240, 15840, 29120, 181632, 333200, 2724480, 93358848, 1400382720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

Factorization of a(11) : 17*5^2*2^4*7^2.

CROSSREFS

Cf. A034448, A144672, A144674.

Sequence in context: A136908 A196748 A144674 * A144672 A145681 A108061

Adjacent sequences:  A144670 A144671 A144672 * A144674 A144675 A144676

KEYWORD

nonn,more

AUTHOR

Yasutoshi Kohmoto, Feb 02 2009

STATUS

approved

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Last modified August 9 01:35 EDT 2020. Contains 336310 sequences. (Running on oeis4.)