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 A183292 Complement of A055999. 0

%I #7 Jan 20 2016 11:58:42

%S 1,2,3,5,6,7,8,10,11,12,13,14,16,17,18,19,20,21,23,24,25,26,27,28,29,

%T 31,32,33,34,35,36,37,38,40,41,42,43,44,45,46,47,48,50,51,52,53,54,55,

%U 56,57,58,59,61,62,63,64,65,66,67,68,69,70,71,73,74,75,76,77,78,79,80,81,82,83,84,86,87,88,89,90

%N Complement of A055999.

%F (See the Mathematica code.)

%t a=1/2; b=7/2;

%t F[n_]:=a*n^2+b*n;

%t R[n_]:=(n/a+((b-1)/(2a))^2)^(1/2);

%t G[n_]:=n-1+Ceiling[R[n]-(b-1)/(2a)];

%t Table[F[n], {n,60}]

%t Table[G[n], {n,100}]

%o (PARI) a(n)=n-1+ceil(sqrt(8*n+25)/2-5/2) \\ _Charles R Greathouse IV_, Jan 20 2016

%Y Cf. A055999.

%K nonn

%O 1,2

%A _Clark Kimberling_, Jan 03 2011

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Last modified September 9 19:47 EDT 2024. Contains 375765 sequences. (Running on oeis4.)