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A110286 15*2^n. 9

%I

%S 15,30,60,120,240,480,960,1920,3840,7680,15360,30720,61440,122880,

%T 245760,491520,983040,1966080,3932160,7864320,15728640,31457280,

%U 62914560,125829120,251658240,503316480,1006632960,2013265920,4026531840,8053063680,16106127360

%N 15*2^n.

%C The first differences are the sequence itself. Doubling the terms gives the same sequence (beginning one step further).

%C a(n) = A173787(n+4,n). - _Reinhard Zumkeller_, Feb 28 2010

%C Subsequence of A051916. - _Reinhard Zumkeller_, Mar 20 2010

%H Vincenzo Librandi, <a href="/A110286/b110286.txt">Table of n, a(n) for n = 0..235</a>

%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (2)

%F G.f.: 15/(1-2x). - _Philippe Deléham_, Nov 23 2008

%F a(n) = A000079(n)*15 = A007283(n)*5 = A020714(n)*3. - _Omar E. Pol_, Dec 17 2008

%F a(n)=2*a(n-1) (with a(0)=15). - _Vincenzo Librandi_, Dec 26 2010

%t 15*2^Range[0, 60] (* _Vladimir Joseph Stephan Orlovsky_, Jun 09 2011 *)

%t NestList[2#&,15,30] (* _Harvey P. Dale_, Oct 19 2014 *)

%o (MAGMA) [15*2^n: n in [0..40]]; // _Vincenzo Librandi_, Apr 28 2011

%o (PARI) a(n)=15<<n \\ _Charles R Greathouse IV_, Oct 07 2015

%Y Cf. A007283, A020714, A005009, A005010, A005015, A005029.

%K easy,nonn

%O 0,1

%A _Alexandre Wajnberg_, Sep 07 2005

%E Edited by _Omar E. Pol_, Dec 16 2008

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Last modified April 19 16:18 EDT 2019. Contains 322282 sequences. (Running on oeis4.)