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A019863
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Decimal expansion of sine of 54 degrees.
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3
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8, 0, 9, 0, 1, 6, 9, 9, 4, 3, 7, 4, 9, 4, 7, 4, 2, 4, 1, 0, 2, 2, 9, 3, 4, 1, 7, 1, 8, 2, 8, 1, 9, 0, 5, 8, 8, 6, 0, 1, 5, 4, 5, 8, 9, 9, 0, 2, 8, 8, 1, 4, 3, 1, 0, 6, 7, 7, 2, 4, 3, 1, 1, 3, 5, 2, 6, 3, 0, 2, 3, 1, 4, 0, 9, 4, 5, 1, 2, 2, 4, 8, 5, 3, 6, 0, 3, 6, 0, 2, 0, 9, 4, 6, 9, 5, 5, 6, 8
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Wikipedia, Exact trigonometric constants
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FORMULA
| Equals [1+sqrt(5)]/4 = cos(Pi/5) = sin(3Pi/10) - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 18 2006
Equals 2F1(4/5,1/5;1/2;3/4) / 2 = A019827 + 1/2 . [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 27 2008]
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MATHEMATICA
| RealDigits[(1 + Sqrt[5])/4, 10, 111] (* RGWv *)
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PROG
| (PARI) (1+sqrt(5))/4 \\ Charles R Greathouse IV, Jan 16 2012
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CROSSREFS
| Sequence in context: A076350 A197617 A005076 * A198820 A138285 A085291
Adjacent sequences: A019860 A019861 A019862 * A019864 A019865 A019866
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KEYWORD
| nonn,cons
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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