The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A009422 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A009422

Expansion of log(1+x)*log(1+tan(x)).
(history; published version)

#15 by Jon E. Schoenfield at Tue Jun 23 21:41:56 EDT 2015

STATUS

editing

approved

#14 by Jon E. Schoenfield at Tue Jun 23 21:41:54 EDT 2015

NAME

Expansion of lnlog(1+x)*lnlog(1+tan(x)).

EXTENSIONS

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

STATUS

approved

editing

#13 by Vaclav Kotesovec at Sun Feb 01 03:59:53 EST 2015

STATUS

editing

approved

#12 by Vaclav Kotesovec at Sun Feb 01 03:59:48 EST 2015

NAME

Expansion of ln(1+x).*ln(1+tan(x)).

STATUS

approved

editing

#11 by Vaclav Kotesovec at Fri Jan 23 09:40:08 EST 2015

STATUS

editing

approved

#10 by Vaclav Kotesovec at Fri Jan 23 09:39:52 EST 2015

FORMULA

a(n) ~ (n-1)! * (-1)^n * (4/Pi)^n * log(4/(4-Pi)). - Vaclav Kotesovec, Jan 23 2015

#9 by Vaclav Kotesovec at Fri Jan 23 09:37:19 EST 2015

MATHEMATICA

CoefficientList[Series[Log[1 + x]*Log[1 + Tan[x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)

STATUS

approved

editing

#8 by N. J. A. Sloane at Mon Jan 27 09:12:51 EST 2014

EXTENSIONS

Extended with signs Mar 15 1997 by _Olivier GerardGérard_.

Discussion

Mon Jan 27

09:12

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

#7 by Russ Cox at Sat Mar 31 12:34:52 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,easy,new

AUTHOR

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