%I #26 Dec 27 2021 21:49:41
%S 21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,
%T 21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,
%U 21,21,21,21,21,21,21,21
%N Constant sequence: a(n) = 21.
%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H <a href="/index/Di#divseq">Index to divisibility sequences</a>
%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F G.f.: 21/(1-x); e.g.f.: 21*e^x. - _Vincenzo Librandi_, Jan 24 2012
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_
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