|
| |
|
|
A019881
|
|
Decimal expansion of sine of 72 degrees.
|
|
11
| |
|
|
9, 5, 1, 0, 5, 6, 5, 1, 6, 2, 9, 5, 1, 5, 3, 5, 7, 2, 1, 1, 6, 4, 3, 9, 3, 3, 3, 3, 7, 9, 3, 8, 2, 1, 4, 3, 4, 0, 5, 6, 9, 8, 6, 3, 4, 1, 2, 5, 7, 5, 0, 2, 2, 2, 4, 4, 7, 3, 0, 5, 6, 4, 4, 4, 3, 0, 1, 5, 3, 1, 7, 0, 0, 8, 5, 1, 9, 3, 5, 0, 1, 7, 1, 8, 7, 9, 2, 8, 1, 0, 9, 7, 0, 8, 1, 1, 3, 8, 1
(list; constant; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,1
|
|
|
COMMENTS
| Circumradius of pentagonal pyramid (Johnson solid 2) with edge 1. - Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 19 2010
|
|
|
LINKS
| Anonymous, Exact trigonometric constants, Wikipedia
Wolfram Alpha, Johnson solid 2
|
|
|
FORMULA
| Equals sqrt((5+sqrt(5))/8) = cos(Pi/10)= 0.9510565162951535721164393333793821434 - Zak Seidov (zakseidov(AT)yahoo.com), Nov 18 2006
Equals 2F1(13/20,7/20;1/2;3/4) / 2. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 27 2008]
|
|
|
MATHEMATICA
| RealDigits[Sqrt[(5 + Sqrt[5])/8], 10, 111] (* RGWv *)
|
|
|
CROSSREFS
| Cf. A001622, A010527, A102208, A179290, A179292, A179294, A179449, A179450, A179451, A179452, A179552, A179553
Sequence in context: A199869 A197378 A201395 * A049256 A019982 A198421
Adjacent sequences: A019878 A019879 A019880 * A019882 A019883 A019884
|
|
|
KEYWORD
| nonn,cons
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
