login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A123397 Values X satisfying the equation 9(X-Y)^4-2XY=0, where X>=Y. 1

%I #12 Feb 15 2020 10:52:26

%S 0,36,39304,45280620,52251208976,60297761989044,69583562098521240,

%T 80299370262508107516,92665403695926847089184,

%U 106935795565612276500481860,123403815417308895154020255656

%N Values X satisfying the equation 9(X-Y)^4-2XY=0, where X>=Y.

%C To find Y values: b(n) = c(n)*(-1+d(n)) which gives: 0, 32, 39168, 45276000, 52251052032, ...

%H G. C. Greubel, <a href="/A123397/b123397.txt">Table of n, a(n) for n = 0..325</a>

%F a(n) = c(n)*(1+d(n)) with c(0) = 0, c(1) = 2 and c(n) = 34*c(n-1) - c(n-2), d(0) = 1, d(1) = 17 and d(n) = 34*d(n-1) - d(n-2).

%F From _Max Alekseyev_, Nov 13 2009: (Start)

%F For n>=4, a(n) = 1188*a(n-1) - 39238*a(n-2) + 1188*a(n-3) - a(n-4).

%F O.g.f.: 4*x*(9*x^2 -866*x +9)/((x^2 -34*x +1)*(x^2 -1154*x +1)). (End)

%t CoefficientList[Series[4*x*(9*x^2 - 866*x + 9)/(x^2 - 34*x + 1)/(x^2 - 1154*x + 1), {x, 0, 50}], x] (* _G. C. Greubel_, Oct 13 2017 *)

%o (PARI) x='x+O('x^50); concat([0], Vec(4*x*(9*x^2 -866*x +9)/((x^2 -34*x +1)*(x^2 -1154*x +1)))) \\ _G. C. Greubel_, Oct 13 2017 *)

%K nonn

%O 0,2

%A _Mohamed Bouhamida_, Oct 14 2006

%E More terms from _Max Alekseyev_, Nov 13 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 18:05 EDT 2024. Contains 371798 sequences. (Running on oeis4.)