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Revision History for A019953

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Showing entries 1-10 | older changes

A019953

Decimal expansion of tangent of 55 degrees.
(history; published version)

#12 by Charles R Greathouse IV at Thu Sep 08 08:44:44 EDT 2022

PROG

(MAGMAMagma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(11*Pi(R)/36); // G. C. Greubel, Nov 22 2018

Discussion

Thu Sep 08

08:44

OEIS Server: https://oeis.org/edit/global/2944

#11 by Bruno Berselli at Fri Nov 23 03:26:37 EST 2018

STATUS

reviewed

approved

#10 by Michel Marcus at Thu Nov 22 23:58:45 EST 2018

STATUS

proposed

reviewed

#9 by G. C. Greubel at Thu Nov 22 20:47:59 EST 2018

STATUS

editing

proposed

#8 by G. C. Greubel at Thu Nov 22 20:47:53 EST 2018

EXAMPLE

1.4281480067421145021606184849985007396338016120753190976117941...

MATHEMATICA

RealDigits[Tan[11*Pi/36], 10, 100][[1]] (* G. C. Greubel, Nov 22 2018 *)

PROG

(PARI) default(realprecision, 100); tan(11*Pi/36) \\ G. C. Greubel, Nov 22 2018

(MAGMA) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(11*Pi(R)/36); // G. C. Greubel, Nov 22 2018

(Sage) numerical_approx(tan(11*pi/36), digits=100) # G. C. Greubel, Nov 22 2018

CROSSREFS

Cf. A019864 (sine of 55 degrees).

AUTHOR

N. J. A. Sloane.

STATUS

approved

editing

#7 by Joerg Arndt at Mon Sep 01 09:49:03 EDT 2014

STATUS

proposed

approved

#6 by Ivan Panchenko at Mon Sep 01 08:21:34 EDT 2014

STATUS

editing

proposed

#5 by Ivan Panchenko at Mon Sep 01 06:57:05 EDT 2014

COMMENTS

Also the decimal expansion of cotangent of 35 degrees. - Ivan Panchenko, Sep 01 2014

LINKS

Ivan Panchenko, <a href="/A019953/b019953.txt">Table of n, a(n) for n = 1..1000</a>

STATUS

approved

editing

#4 by Russ Cox at Fri Mar 30 16:46:33 EDT 2012

AUTHOR

_N. J. A. Sloane (njas(AT)research.att.com)_.

Discussion

Fri Mar 30

16:46

OEIS Server: https://oeis.org/edit/global/110

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

KEYWORD

nonn,cons,new

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).