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A196305 a(n) = 15*2^n - 1. 2

%I

%S 14,29,59,119,239,479,959,1919,3839,7679,15359,30719,61439,122879,

%T 245759,491519,983039,1966079,3932159,7864319,15728639,31457279,

%U 62914559,125829119,251658239,503316479,1006632959,2013265919,4026531839,8053063679,16106127359

%N a(n) = 15*2^n - 1.

%C Primes of this sequence are in A196940.

%H Vincenzo Librandi, <a href="/A196305/b196305.txt">Table of n, a(n) for n = 0..200</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (3,-2).

%F a(n) = 15*2^n - 1.

%F a(n) = A033484(n+1)+A083705(n).

%F a(n) = 2*a(n-1)+1. a(n)=3*a(n-2)-2*a(n-2). - _Philippe Deléham_, Feb 17 2014

%F a(n) = A110286(n)-1. _Philippe Deléham_, Feb 17 2014

%o (MAGMA) [15*2^n -1 : n in [0..50]];

%o (PARI) a(n)=15<<n-1 \\ _Charles R Greathouse IV_, Oct 08 2011

%Y Cf. A033484, A083705, A110286 (first differences).

%K nonn,easy

%O 0,1

%A _Brad Clardy_, Oct 07 2011

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Last modified April 23 06:08 EDT 2019. Contains 322381 sequences. (Running on oeis4.)