The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A323601 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A323601

Decimal expansion of sin(Pi/7).
(history; published version)

#20 by Charles R Greathouse IV at Thu Sep 08 08:46:23 EDT 2022

PROG

(MAGMAMagma) SetDefaultRealField(RealField(100)); R:= RealField(); Sin(Pi(R)/7); // G. C. Greubel, Feb 08 2019

Discussion

Thu Sep 08

08:46

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

#19 by Sean A. Irvine at Sat Aug 07 18:33:45 EDT 2021

STATUS

reviewed

approved

#18 by Vaclav Kotesovec at Sat Jul 17 04:35:59 EDT 2021

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proposed

reviewed

#17 by Michel Marcus at Thu Jul 15 11:44:11 EDT 2021

STATUS

editing

proposed

#16 by Michel Marcus at Thu Jul 15 11:44:08 EDT 2021

FORMULA

From __Gleb Koloskov_, Jul 15 2021: (Start)

Positive root of the equation x^3 + sqrt(7)/2*x^2 - sqrt(7)/8 = 0.

STATUS

proposed

editing

#15 by Gleb Koloskov at Thu Jul 15 11:08:11 EDT 2021

STATUS

editing

proposed

#14 by Gleb Koloskov at Thu Jul 15 11:03:01 EDT 2021

FORMULA

From Gleb Koloskov, Jul 15 2021: (Start)

Positive root of the equation x^3 + sqrt(7)/2*x^2 - sqrt(7)/8 = 0.

Equals ((4*sqrt(7)*(13+3*sqrt(3)*i))^(1/3)+28*(4*sqrt(7)*(13+3*sqrt(3)*i))^(-1/3)-2*sqrt(7))/12, where i is the imaginary unit. (End)

STATUS

approved

editing

#13 by Bruno Berselli at Fri Feb 08 05:37:45 EST 2019

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reviewed

approved

#12 by Vaclav Kotesovec at Fri Feb 08 04:27:40 EST 2019

STATUS

proposed

reviewed

#11 by Michel Marcus at Fri Feb 08 01:20:42 EST 2019

STATUS

editing

proposed