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a(n) = 27*n.
3

%I #53 Feb 25 2019 07:47:18

%S 0,27,54,81,108,135,162,189,216,243,270,297,324,351,378,405,432,459,

%T 486,513,540,567,594,621,648,675,702,729,756,783,810,837,864,891,918,

%U 945,972,999,1026,1053,1080,1107,1134,1161,1188,1215,1242,1269,1296,1323,1350,1377,1404,1431,1458,1485,1512

%N a(n) = 27*n.

%H Eric Chen, <a href="/A305548/b305548.txt">Table of n, a(n) for n = 0..1000</a>

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

%F a(n) = 27*n.

%F a(n) = A008585(A008591(n)) = A008591(A008585(n)).

%F G.f.: 27*x/(x-1)^2.

%t Range[0,2000,27]

%o (PARI) a(n)=27*n

%Y For a(n) = k*n: A001489 (k=-1), A000004 (k=0), A001477 (k=1), A005843 (k=2), A008585 (k=3) - A008607 (k=25), A252994 (k=26), this sequence (k=27), A135628 (k=28), A195819 (k=29), A249674 (k=30), A135631 (k=31), A174312 (k=32), A044102 (k=36), A085959 (k=37), A169823 (k=60), A152691 (k=64).

%K nonn,easy

%O 0,2

%A _Eric Chen_, Jun 05 2018