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n-1+ceiling((n/6)^2); complement of A184106.
1

%I #12 Jun 13 2015 00:53:42

%S 1,2,3,4,5,6,8,9,11,12,14,15,17,19,21,23,25,26,29,31,33,35,37,39,42,

%T 44,47,49,52,54,57,60,63,66,69,71,75,78,81,84,87,90,94,97,101,104,108,

%U 111,115,119,123,127,131,134,139,143,147,151,155,159,164,168,173,177,182,186,191,196,201,206

%N n-1+ceiling((n/6)^2); complement of A184106.

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

%t a=36; b=0;

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

%t Table[n-1+Ceiling[(n^2-b)/a],{n,70}]

%Y Cf. A184106.

%K nonn,easy

%O 1,2

%A _Clark Kimberling_, Jan 09 2011