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A194404 Numbers m such that Sum_{k=1..m} (<1/2 + k*r> - <k*r>) > 0, where r=(1+sqrt(5))/2 and < > denotes fractional part. 5

%I #11 Feb 15 2021 02:19:21

%S 5,7,13,15,39,41,47,49,73,75,81,83,89,91,93,94,95,96,97,99,101,102,

%T 103,104,105,107,109,115,117,123,125,127,128,129,130,131,133,135,136,

%U 137,138,139,141,143,149,151,157,159,183,185,191,193,217,219,225

%N Numbers m such that Sum_{k=1..m} (<1/2 + k*r> - <k*r>) > 0, where r=(1+sqrt(5))/2 and < > denotes fractional part.

%C See A194368.

%t r = GoldenRatio; c = 1/2;

%t x[n_] := Sum[FractionalPart[k*r], {k, 1, n}]

%t y[n_] := Sum[FractionalPart[c + k*r], {k, 1, n}]

%t t1 = Table[If[y[n] < x[n], 1, 0], {n, 1, 200}];

%t Flatten[Position[t1, 1]] (* A194401 *)

%t t2 = Table[If[y[n] == x[n], 1, 0], {n, 1, 200}];

%t Flatten[Position[t2, 1]] (* A194402 *)

%t %/2 (* A194403 *)

%t t3 = Table[If[y[n] > x[n], 1, 0], {n, 1, 200}];

%t Flatten[Position[t3, 1]] (* A194404 *)

%Y Cf. A001622, A194368, A194401, A194402, A194403.

%K nonn

%O 1,1

%A _Clark Kimberling_, Aug 24 2011

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)