The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A009808

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A009808

Expansion of tanh(tan(tan(x))).
(history; published version)

#13 by Jon E. Schoenfield at Sun Apr 02 14:28:01 EDT 2017

STATUS

editing

approved

#12 by Jon E. Schoenfield at Sun Apr 02 14:27:59 EDT 2017

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997.

STATUS

approved

editing

#11 by N. J. A. Sloane at Sat Apr 01 07:24:23 EDT 2017

EXTENSIONS

Extended with signs Mar 15 1997 by Olivier Gérard, Mar 15 1997.

Discussion

Sat Apr 01

07:24

OEIS Server: https://oeis.org/edit/global/2624

#10 by Harvey P. Dale at Sun Jun 12 09:19:07 EDT 2016

STATUS

editing

approved

#9 by Harvey P. Dale at Sun Jun 12 09:19:03 EDT 2016

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Tanh[ Tan[ Tan[ x ] ] ] , {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Odd Part _Harvey P. Dale_, Jun 12 2016 *)

EXTENSIONS

Prior Mathematica program replaced by Harvey P. Dale, Jun 12 2016

STATUS

approved

editing

#8 by N. J. A. Sloane at Mon Jan 27 09:13:02 EST 2014

EXTENSIONS

Extended with signs Mar 15 1997 by _Olivier GerardGérard_.

Discussion

Mon Jan 27

09:13

OEIS Server: https://oeis.org/edit/global/2111

#7 by Russ Cox at Sat Mar 31 12:34:57 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net)_

Discussion

Sat Mar 31

12:34

OEIS Server: https://oeis.org/edit/global/875

#6 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

sign,new

sign

AUTHOR

R. H. Hardin (rhhrhhardin(AT)cadenceatt.comnet)

#5 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

KEYWORD

sign,done,new

sign

AUTHOR

R. H. Hardin (rhh@research.att(AT)cadence.com)

EXTENSIONS

Extended with signs 03/97 Mar 15 1997 by Olivier Gerard.

#4 by N. J. A. Sloane at Sat Dec 11 03:00:00 EST 1999

MATHEMATICA

Tanh[ Tan[ Tan[ x ] ] ] (* Odd Part *)

KEYWORD

sign,done,new