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A183863 n-1+ceiling((2/5)(-1/2+n^2)); complement of A183862. 1


%S 1,3,6,10,14,20,26,33,41,49,59,69,80,92,104,118,132,147,163,179,197,

%T 215,234,254,274,296,318,341,365,389,415,441,468,496,524,554,584,615,

%U 647,679,713,747,782,818,854,892,930,969,1009,1049,1091,1133,1176,1220,1264,1310,1356,1403,1451,1499,1549,1599,1650,1702,1754,1808,1862,1917,1973,2029

%N n-1+ceiling((2/5)(-1/2+n^2)); complement of A183862.

%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)=n-1+ceiling((2/5)(-1/2+n^2)).

%t a=5/2; b=1/2;

%t Table[n+Floor[(a*n+b)^(1/2)],{n,80}]

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

%Y Cf., A183862.

%K nonn,easy

%O 1,2

%A _Clark Kimberling_, Jan 07 2011

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Last modified October 26 22:19 EDT 2021. Contains 348269 sequences. (Running on oeis4.)