The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A019881 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A019881

Decimal expansion of sin(2*Pi/5) (sine of 72 degrees).
(history; published version)

#82 by Charles R Greathouse IV at Sun Feb 16 08:32:33 EST 2025

LINKS

Eric Weisstein's World of Mathematics, <a href="httphttps://mathworld.wolfram.com/GoldenRhombus.html">Golden Rhombus</a>.

Discussion

Sun Feb 16

08:32

OEIS Server: https://oeis.org/edit/global/3014

#81 by Michael De Vlieger at Mon Jan 27 16:46:37 EST 2025

STATUS

proposed

approved

#80 by Stefano Spezia at Mon Jan 27 15:45:21 EST 2025

STATUS

editing

proposed

#79 by Stefano Spezia at Mon Jan 27 15:28:13 EST 2025

LINKS

Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GoldenRhombus.html">Golden Rhombus</a>.

Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a>.

Wikipedia, <a href="http://en.wikipedia.org/wiki/Platonic solid">Platonic solid</a>.

Wolfram Alpha, <a href="http://www.wolframalpha.com/input/?i=Johnson+solid+2">Johnson solid 2</a>.

<a href="/index/Al#algebraic_04">Index entries for algebraic numbers, degree 4</a>.

#78 by Stefano Spezia at Mon Jan 27 15:27:45 EST 2025

REFERENCES

Jan Gullberg, Mathematics from the Birth of Numbers, W. W. Norton & Co., NY & London, 1997, §12.4 Theorems and Formulas (Solid Geometry), p. 451.

KEYWORD

nonn,cons,easy

STATUS

approved

editing

#77 by Alois P. Heinz at Wed Jul 10 20:12:25 EDT 2024

STATUS

proposed

approved

#76 by Robert C. Lyons at Wed Jul 10 19:54:20 EDT 2024

STATUS

editing

proposed

#75 by Robert C. Lyons at Wed Jul 10 19:54:13 EDT 2024

PROG

real(I^(1/5)) // _\\ _Rick L. Shepherd_, Apr 10 2017

STATUS

approved

editing

#74 by Charles R Greathouse IV at Mon Aug 21 11:37:07 EDT 2023

STATUS

editing

approved

#73 by Charles R Greathouse IV at Mon Aug 21 11:37:06 EDT 2023

LINKS

<a href="/index/Al#algebraic_04">Index entries for algebraic numbers, degree 4</a>

STATUS

approved

editing