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A164538 a(n) = 10*a(n-1) - 23*a(n-2) for n > 1; a(0) = 5, a(1) = 33. 2

%I #19 Sep 08 2022 08:45:47

%S 5,33,215,1391,8965,57657,370375,2377639,15257765,97891953,627990935,

%T 4028394431,25840152805,165748456137,1063161046855,6819395977399,

%U 43741255696325,280566449483073,1799615613815255,11543127800041871

%N a(n) = 10*a(n-1) - 23*a(n-2) for n > 1; a(0) = 5, a(1) = 33.

%C Binomial transform of A164537. Fifth binomial transform of A164682.

%H Vincenzo Librandi, <a href="/A164538/b164538.txt">Table of n, a(n) for n = 0..151</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (10,-23).

%F a(n) = 10*a(n-1) - 23*a(n-2) for n > 1; a(0) = 5, a(1) = 33.

%F G.f.: (5-17*x)/(1-10*x+23*x^2).

%F a(n) = ((5+4*sqrt(2))*(5+sqrt(2))^n + (5-4*sqrt(2))*(5-sqrt(2))^n)/2.

%t LinearRecurrence[{10,-23},{5,33},20] (* _Harvey P. Dale_, May 29 2019 *)

%o (Magma) Z<x>:=PolynomialRing(Integers()); N<r>:=NumberField(x^2-2); S:=[ ((5+4*r)*(5+r)^n+(5-4*r)*(5-r)^n)/2: n in [0..19] ]; [ Integers()!S[j]: j in [1..#S] ]; // _Klaus Brockhaus_, Aug 21 2009

%o (PARI) Vec((5-17*x)/(1-10*x+23*x^2)+O(x^99)) \\ _Charles R Greathouse IV_, Jun 14 2011

%Y Cf. A164537, A164682.

%K nonn,easy

%O 0,1

%A Al Hakanson (hawkuu(AT)gmail.com), Aug 15 2009

%E Edited and extended beyond a(5) by _Klaus Brockhaus_, Aug 21 2009

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)