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A194425 Numbers m such that Sum_{k=1..m} (<2/3 + k*r> - <k*r>) > 0, where r=sqrt(2) and < > denotes fractional part. 5

%I #11 Feb 14 2021 21:53:49

%S 5,8,10,11,17,20,22,23,29,32,34,35,37,38,39,40,41,44,46,47,49,50,51,

%T 52,53,56,58,59,61,62,63,64,65,68,80,92,104,107,109,110,116,119,121,

%U 122,128,131,133,134,136,137,138,139,140,143,145,146,148,149,150

%N Numbers m such that Sum_{k=1..m} (<2/3 + k*r> - <k*r>) > 0, where r=sqrt(2) and < > denotes fractional part.

%C See A194368.

%H G. C. Greubel, <a href="/A194425/b194425.txt">Table of n, a(n) for n = 1..2230</a>

%t r = Sqrt[2]; c = 2/3;

%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, 300}];

%t Flatten[Position[t1, 1]] (* A194422 *)

%t t2 = Table[If[y[n] == x[n], 1, 0], {n, 1, 300}];

%t Flatten[Position[t2, 1]] (* A194423 *)

%t %/3 (* A194424 *)

%t t3 = Table[If[y[n] > x[n], 1, 0], {n, 1, 300}];

%t Flatten[Position[t3, 1]] (* A194425 *)

%Y Cf. A194368.

%K nonn

%O 1,1

%A _Clark Kimberling_, Aug 24 2011

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)