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Numbers >= 3.
4

%I #20 Apr 17 2021 10:38:22

%S 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,

%T 28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,

%U 51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77

%N Numbers >= 3.

%C Same as Pisot sequences E(3,4), P(3,4), T(3,4). See A008776 for definitions of Pisot sequences.

%C Non-Fermat-exponents, positive integers n such that there are no solutions in positive integers of the equation a^n+b^n = c^n. - _Tanya Khovanova_, Jul 09 2011

%C Sums of twin primes. - _Charles R Greathouse IV_, Jun 21 2012

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

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).

%F a(n) = n+2.

%F O.g.f.: x*(3-2*x)/(1-x)^2. a(n)=A009005(n-1), n>2. - _R. J. Mathar_, May 26 2008

%t Range[3,80] (* _Harvey P. Dale_, Sep 26 2017 *)

%o (PARI) a(n)=n+2 \\ _Charles R Greathouse IV_, Jun 21 2012

%K easy,nonn

%O 1,1

%A _David W. Wilson_