The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A006337 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A006337

An "eta-sequence": a(n) = floor( (n+1)*sqrt(2) ) - floor( n*sqrt(2) ).
(history; published version)

#81 by Alois P. Heinz at Fri Aug 05 19:21:57 EDT 2022

STATUS

editing

approved

#80 by Alois P. Heinz at Wed Aug 03 19:34:45 EDT 2022

NAME

An "eta-sequence": a(n) = floor( (n+1)*sqrt(2) ) - floor( n*sqrt(2) ).

STATUS

proposed

editing

#79 by Chai Wah Wu at Wed Aug 03 19:18:07 EDT 2022

STATUS

editing

proposed

#78 by Chai Wah Wu at Wed Aug 03 19:18:02 EDT 2022

PROG

(Python)

from math import isqrt

def A006337(n): return -isqrt(m:=n*n<<1)+isqrt(m+(n<<2)+2) # Chai Wah Wu, Aug 03 2022

STATUS

approved

editing

#77 by Jon E. Schoenfield at Wed Dec 22 00:06:45 EST 2021

STATUS

editing

approved

#76 by Jon E. Schoenfield at Wed Dec 22 00:06:37 EST 2021

LINKS

T. D. Noe, <a href="/A006337/b006337.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#75 by N. J. A. Sloane at Wed Mar 24 15:35:58 EDT 2021

LINKS

N. J. A. Sloane, <a href="/A115004/a115004.txt">Families ofEssentially of Essentially Identical Sequences</a>, Mar 24 2021 (Includes this sequence)

Discussion

Wed Mar 24

15:35

OEIS Server: https://oeis.org/edit/global/2900

#74 by Susanna Cuyler at Wed Mar 24 14:30:21 EDT 2021

STATUS

editing

approved

#73 by Susanna Cuyler at Wed Mar 24 14:30:18 EDT 2021

LINKS

N. J. A. Sloane, <a href="/A115004/a115004.txt">Families ofEssentially Identical Sequences</a>, Mar 24 2021 (Includes this sequence)

STATUS

approved

editing

#72 by N. J. A. Sloane at Thu Mar 11 22:11:15 EST 2021

STATUS

editing

approved