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A194409 Numbers m such that Sum_{k=1..m} (<1/2 + k*r> - <k*r>) = 0, where r=Pi and < > denotes fractional part. 4

%I #8 Feb 15 2021 20:01:22

%S 6,8,12,16,18,24,88,94,96,100,104,106,112,114,118,122,124,130,208,214,

%T 216,220,224,228,230,236,328,334,336,342,448

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

%C Every term is even; see A194368.

%t r = Pi; 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, 100}];

%t Flatten[Position[t1, 1]] (* A194408 *)

%t t2 = Table[If[y[n] == x[n], 1, 0], {n, 1, 1500}];

%t Flatten[Position[t2, 1]] (* A194409 *)

%t t3 = Table[If[y[n] > x[n], 1, 0], {n, 1, 1500}];

%t Flatten[Position[t3, 1]] (* A194410 *)

%Y Cf. A194368.

%K nonn

%O 1,1

%A _Clark Kimberling_, Aug 24 2011

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)