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A017377 a(n) = 10*n + 9. 25

%I

%S 9,19,29,39,49,59,69,79,89,99,109,119,129,139,149,159,169,179,189,199,

%T 209,219,229,239,249,259,269,279,289,299,309,319,329,339,349,359,369,

%U 379,389,399,409,419,429,439,449,459,469,479,489,499,509,519,529,539

%N a(n) = 10*n + 9.

%C Numbers k such that k^k ends with 9. - _Bruno Berselli_, Dec 11 2018

%H Vincenzo Librandi, <a href="/A017377/b017377.txt">Table of n, a(n) for n = 0..5000</a>

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

%H INRIA Algorithms Project, <a href="http://ecs.inria.fr/services/structure?nbr=979">Encyclopedia of Combinatorial Structures 979</a>

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

%F a(n) = 10*n + 9; a(n) = 2*a(n-1) - a(n-2). - _Vincenzo Librandi_, May 29 2011

%F G.f.: ( 9+x ) / (x-1)^2 . - _R. J. Mathar_, Oct 16 2015

%t Range[9, 1000, 10] (* _Vladimir Joseph Stephan Orlovsky_, May 28 2011 *)

%o (MAGMA) [10*n+9: n in [0..60]]; // _Vincenzo Librandi_, May 29 2011

%o (PARI) a(n)=10*n+9 \\ _Charles R Greathouse IV_, Feb 12 2017

%Y Cf. A008592, A017365, A190876.

%K nonn,easy

%O 0,1

%A _N. J. A. Sloane_

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Last modified March 23 17:19 EDT 2019. Contains 321432 sequences. (Running on oeis4.)