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 A183871 a(n) = n + ceiling( (1/5)*n^2 ). Complement of A183870. 1

%I #14 Mar 15 2021 09:53:18

%S 2,3,5,8,10,14,17,21,26,30,36,41,47,54,60,68,75,83,92,100,110,119,129,

%T 140,150,162,173,185,198,210,224,237,251,266,280,296,311,327,344,360,

%U 378,395,413,432,450,470,489,509,530,550,572,593,615,638,660,684,707,731,756,780,806,831,857,884,910,938,965,993,1022,1050,1080,1109,1139,1170,1200,1232,1263,1295,1328,1360

%N a(n) = n + ceiling( (1/5)*n^2 ). Complement of A183870.

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1,0,0,1,-2,1).

%F a(n) = floor( (n+1)*(n+4)/5 ). [_Bruno Berselli_, Mar 05 2014]

%t a=5; b=-5;

%t Table[n+Floor[(a*n+b)^(1/2)],{n,100}]

%t Table[n-1+Ceiling[(n*n-b)/a],{n,80}]

%Y Cf. A183870.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, Jan 07 2011

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Last modified May 28 22:21 EDT 2023. Contains 363028 sequences. (Running on oeis4.)