The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A194387 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A194387

Numbers m such that Sum_{k=1..m} (<1/2 + k*r> - <k*r>) < 0, where r=sqrt(11) and < > denotes fractional part.
(history; published version)

#10 by Joerg Arndt at Mon Feb 15 02:20:59 EST 2021

STATUS

proposed

approved

#9 by Michel Marcus at Mon Feb 15 00:49:43 EST 2021

STATUS

editing

proposed

#8 by Michel Marcus at Mon Feb 15 00:49:41 EST 2021

CROSSREFS

Cf. A010468, A194368, A194388, A194389.

STATUS

proposed

editing

#7 by Jon E. Schoenfield at Sun Feb 14 23:46:16 EST 2021

STATUS

editing

proposed

#6 by Jon E. Schoenfield at Sun Feb 14 23:46:14 EST 2021

NAME

Numbers n m such that sumSum_{k=1..m} (<1/2 + k*r> - <k*r> : 1<=k<=n}) < 0, where r=sqrt(11) and < > denotes fractional part.

STATUS

approved

editing

#5 by Russ Cox at Fri Mar 30 18:57:43 EDT 2012

AUTHOR

_Clark Kimberling (ck6(AT)evansville.edu), _, Aug 23 2011

Discussion

Fri Mar 30

18:57

OEIS Server: https://oeis.org/edit/global/285

#4 by T. D. Noe at Tue Aug 23 15:46:43 EDT 2011

STATUS

proposed

approved

#3 by Clark Kimberling at Tue Aug 23 15:43:15 EDT 2011

STATUS

editing

proposed

#2 by Clark Kimberling at Tue Aug 23 14:58:30 EDT 2011

NAME

allocated for Clark KimberlingNumbers n such that sum{<1/2+k*r>-<k*r> : 1<=k<=n}<0, where r=sqrt(11) and < > denotes fractional part.

DATA

3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 25, 27, 28, 29, 31, 47, 49, 50, 51, 53, 63, 65, 66, 67, 68, 69, 70, 71, 72, 73, 75, 85, 87, 88, 89, 91, 107, 109, 110, 111, 113, 123, 125, 126, 127, 128, 129, 130, 131, 132, 133, 135, 145, 147, 148, 149, 151, 167, 169, 170

OFFSET

1,1

COMMENTS

See A194368.

MATHEMATICA

r = Sqrt[11]; c = 1/2;

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

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

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

Flatten[Position[t1, 1]] (* A194387 *)

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

Flatten[Position[t2, 1]] (* A194388 *)

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

Flatten[Position[t3, 1]] (* A194389 *)

CROSSREFS

Cf. A194368.

KEYWORD

allocated

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu), Aug 23 2011

STATUS

approved

editing

#1 by Clark Kimberling at Tue Aug 23 09:43:11 EDT 2011

NAME

allocated for Clark Kimberling

KEYWORD

allocated

STATUS

approved