The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A137762 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A137762

Central elements in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle.
(history; published version)

#9 by N. J. A. Sloane at Sat Jun 22 16:06:10 EDT 2013

AUTHOR

__Mohammad K. Azarian__, , Feb 13 2008

Discussion

Sat Jun 22

16:06

OEIS Server: https://oeis.org/edit/global/1931

#8 by N. J. A. Sloane at Fri Jun 21 12:51:06 EDT 2013

AUTHOR

__Mohammad K. Azarian_, _, Feb 13 2008

Discussion

Fri Jun 21

12:51

OEIS Server: https://oeis.org/edit/global/1930

#7 by Joerg Arndt at Wed Apr 17 02:34:14 EDT 2013

STATUS

proposed

approved

#6 by Michel Marcus at Wed Apr 17 00:37:36 EDT 2013

STATUS

editing

proposed

#5 by Michel Marcus at Wed Apr 17 00:37:32 EDT 2013

EXAMPLE

1/1; 1/2, 1/2; 1/3, 5/6, 1/3; 1/4, 7/12, 7/12, 1/4; 1/5, 9/20, 31/30, 9/20, 1/5;

1/1; --> 1 1

1/2, 1/2; -->

1/3, 5/6, 1/3; --> 5 6

1/4, 7/12, 7/12, 1/4; --> ...

1/5, 9/20, 31/30, 9/20, 1/5;

KEYWORD

nonn,tabltabf,frac

STATUS

approved

editing

#4 by Russ Cox at Fri Mar 30 19:00:00 EDT 2012

AUTHOR

_Mohammad K. Azarian (azarian(AT)evansville.edu), _, Feb 13 2008

Discussion

Fri Mar 30

19:00

OEIS Server: https://oeis.org/edit/global/294

#3 by M. F. Hasler at Wed Jan 25 14:53:24 EST 2012

STATUS

editing

approved

#2 by M. F. Hasler at Wed Jan 25 14:53:11 EST 2012

FORMULA

a(2n-1)=A137763(2n); a(2n)=A137763(2n-1)=A046212(2n-1)=A056040(2n-1)=A100071(2n-1). - M. F. Hasler, Jan 25 2012

STATUS

approved

editing

#1 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

NAME

Central elements in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle.

DATA

1, 1, 5, 6, 31, 30, 209, 140, 1471, 630, 10625, 2772

OFFSET

1,3

EXAMPLE

1/1; 1/2, 1/2; 1/3, 5/6, 1/3; 1/4, 7/12, 7/12, 1/4; 1/5, 9/20, 31/30, 9/20, 1/5;

CROSSREFS

Cf. A046201; A046204; A046205; A046206; A046208; A046212; A137752; A137753; A137754; A137755; A137756; A137757; A137758; A137759, A137760; A137761.

KEYWORD

nonn,tabl

AUTHOR

Mohammad K. Azarian (azarian(AT)evansville.edu), Feb 13 2008

STATUS

approved