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0.176326980708464973471090386868618986121633...
(PARI) tan(Pi/18) \\ Hugo Pfoertner, Aug 04 2024
Cf. A019918.
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Ivan Panchenko, <a href="/A019908/b019908.txt">Table of n, a(n) for n = 0..1000</a>
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Also the decimal expansion of cotangent of 80 degrees._ - _Mohammad K. Azarian_, Jun 29 30 2013