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A019916 Decimal expansion of tangent of 18 degrees. 0
3, 2, 4, 9, 1, 9, 6, 9, 6, 2, 3, 2, 9, 0, 6, 3, 2, 6, 1, 5, 5, 8, 7, 1, 4, 1, 2, 2, 1, 5, 1, 3, 4, 4, 6, 4, 9, 5, 4, 9, 0, 3, 4, 7, 1, 5, 2, 1, 4, 7, 5, 1, 0, 0, 3, 0, 7, 8, 0, 4, 7, 1, 9, 1, 3, 6, 6, 7, 2, 9, 0, 0, 9, 6, 0, 7, 4, 4, 9, 4, 8, 3, 2, 2, 6, 8, 7, 7, 3, 5, 4, 4, 6, 9, 6, 5, 0, 5, 0 (list; constant; graph; refs; listen; history; internal format)
OFFSET

0,1

LINKS

Anonymous, Exact trigonometric constants, Wikipedia

FORMULA

Equals A019827/A019881 = 1/A019970 = 1/sqrt(5+2*sqrt(5)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 26 2010]

CROSSREFS

Sequence in context: A075087 A084657 A171559 * A201838 A099257 A083762

Adjacent sequences:  A019913 A019914 A019915 * A019917 A019918 A019919

KEYWORD

nonn,cons

AUTHOR

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

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Last modified February 14 16:17 EST 2012. Contains 205635 sequences.